entity framework get field by name

Posted on November 7, 2022 by

Find centralized, trusted content and collaborate around the technologies you use most. I've read a lot of answers about Reflection, but also comments that it's heavy processing (may be a bit excessive for my needs). 504), Mobile app infrastructure being decommissioned, Entity Framework - How to load data by name of Entity, Dynamically set the table name in LINQ query, How to have a unique C# code with different Entities EF having the same columns. @user1209216 - I am sorry, the most important part was missing, added it to the code snipped above. Thanks for contributing an answer to Stack Overflow! using ( var db = new YourContext () ) { var metadataWorkspace . Will it have a bad influence on getting a student visa? I am into a situation that my table names are different from the class property on the model using mapping in EF 6. the Model and Database goes like this: which is equivalent to an AGENT class that has those properties. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Column or index Search refers to unknown column in tsvector definition This is a brand new model which has not been included in a migration before, if that's relevant at all. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I'm little newbie with this, so I need to ask. But he says "field.Name" does not return the expected value. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea. This means that the corresponding DbSet . He also has an important commentary . legal basis for "discretionary spending" vs. "mandatory spending" in the USA, Removing repeating rows and columns from 2d array. I need to pass report type as string. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. It should be something like this If you use generics to determine the type, you will be able to properly cast the object and don't have to return a dynamic even. Going from engineer to entrepreneur takes more than just good code (Ep. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Indonesia Coordinates: 5S 120E Indonesia, [a] officially the Republic of Indonesia, [b] is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. Type returned by ToList does not matter, because GetData return type is dynamic - so it can be any type, @user1209216 - you are using dynamic to work around a problem as it seems to me. 503), Fighting to balance identity and anonymity on the web(3) (Ep. Reflection-based approach won't work in fluent API case. Adding existing entities to a collection on a newly built object using the entity framework, LINQ to Entities only supports casting in the Entity Framework. You can do it using reflection, however you will also need to use generics because the type of list returned by the ToList() method is different for each entity type. The above example will execute the following SQL in the database. But, the problem: I'm rather looking for my method with "switch" equivalent. The method uses LINQ to Entities to specify the column to sort by. It is also the same as Table attribute, but Table attribute overrides the table behavior while Column attribute overrides the column behavior. var enumerable = (IEnumerable<TEntity>) (typeof ( [ClassNameOfContext]).GetProperty (name).GetValue (ctx, null)); return enumerable.ToList (); here it is! Right-click the Controllers folder in Solution Explorer, select Add, and then click New Scaffolded Item. IGF 2010 VILNIUS, LITHUANIA 17 SEPTEMBER 2010 SESSION 721130 - 1330INTEGRATED APPROACH FOR CHILD PROTECTION ONLINE*****Note: The following is the output of the real-time captioning taken during Fifth Meeting of the IGF, in Vilnius. Use the ForeignKey and Column attributes to fix this: [ForeignKey ("SoftwareSystem"),Column ("SoftwareSystemId")] public int SoftwareSystemId { get; set; } By default the foreign key will be added with "Id" behind it, but because you already have a property with that name (and EF doesn't recognize it's the foreignkey apparantly . EF actually handles that situation automatically by just naming the second entity object MyEntity1. Can an adult sue someone who violated them as a child? apply to documents without the need to be rewritten? Find centralized, trusted content and collaborate around the technologies you use most. Stack Overflow for Teams is moving to its own domain! Find centralized, trusted content and collaborate around the technologies you use most. Can FOSS software licenses (e.g. going to beobject How do I view the SQL generated by the Entity Framework? Not the answer you're looking for? You won't have to return a value if you correctly cast the object by using generics to identify the type.dynamic Get monthly updates by subscribing to our newsletter! The difficulty is thatenumerable You may need to refer to a field-only property from LINQ queries, but such fields are typically private. Is a potential juror protected for what they say during jury selection? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, could you pls tell me what GetObjectContext() is? Find is different from using a query in two . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. where EntityType My profession is written "Unemployed" on my passport. In addition to Alexander's answer, this will get the underlying type for the nullable type: Nullable.GetUnderlyingType will return the underlying Type if it is nullable (i.e. Sorry, I'm still little confused. rev2022.11.7.43014. How can you prove that a certain file was downloaded from a certain website? Is it possible to make a high-side PNP switch circuit active-low with less than 3 BJTs? I want to avoid switch in this sample. How do I access the [Column("pp_added")] to get pp_added instead of the public Name? If he wanted control of the company, why didn't Elon Musk buy 51% of Twitter shares instead of 100%? Can lead-acid batteries be stored by removing the liquid from them? Why are UK Prime Ministers educated at Oxford, not Cambridge? Asking for help, clarification, or responding to other answers. Stack Overflow for Teams is moving to its own domain! It is the. Can an adult sue someone who violated them as a child? Was Gandalf on Middle-earth in the Second Age? In System.Data.Entity.dll (Entity Framework), why am I receiving a NullReferenceException? Going from engineer to entrepreneur takes more than just good code (Ep. In the Add Scaffold dialog box, select MVC 5 Controller with views, using Entity Framework, and then choose Add. Convention is to look for a property named "Id" or one that combines the class name and "Id", such as "StudentId". The. No es necesario registrarse ni instalar. Handling unprepared students as a Teaching Assistant. To learn more, see our tips on writing great answers. It will be safe to conclude that at this point, that the idea of Global Brain, Global Mind and Global Consciousness is neither fact nor fiction. Why doesn't this unzip all my files in a given directory? These entity types need to be configured with a unique name, which must be supplied whenever the shared-type entity type is used, in addition to the CLR type. what namespace is it in? Popular Answer. Not the answer you're looking for? He provides rich historical and political contexts to such projects in Nigeria. Since it was initially a read-only Details view and PersonID wasn't required to be displayed, I didn't first think I needed it. Although you may do this via reflection, you will also need the usage of generics due to the fact that each object type's ToList() function returns a distinct form of list. How can you prove that a certain file was downloaded from a certain website? What are the weather minimums in order to take off under IFR conditions? It is not recognized by the compiler, and . Entity Framework relies on every entity having a key value that it uses for tracking entities. Not the answer you're looking for? 504), Mobile app infrastructure being decommissioned. . Thanks for the answer ahead of time and saving me the 2 days of looking and trying. Entity framework table name different from class name. The former Managing Director of Frontier Capital, Olufemi Edun provided an insightful tour de force of the intricacies of financing and managing big infrastructure projects and investments. Can I do this using reflection? ", Get the Entity Name when calling SaveChanges in Entity Framework 6.1.3, Use a variable table name for Entity Framework SqlQuery to fetch data into entity Class. Esucha 335: Start Messy y 359 ms episodios de The Bike Shed, gratis! Stack Overflow. ), or return null if it's not nullable. When the Littlewood-Richardson rule gives only irreducibles? To learn more, see our tips on writing great answers. I've been fiddling with the index and columns--renaming the columns (ensuring they aren't used by any other table, just in case) had no impact, and neither was removing . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Would a bicycle pump work underwater, with its air-input being above water? Why? is the kind of object you are interacting with. Hence, the ?? even. basic kinds in the Entity Data Model. Can I use reflection for this? Is it enough to verify the hash to ensure file is virus free? How do I view the SQL generated by the Entity Framework? aquaman . Ideas Untrapped. Is this meat that I was told was brisket in Barcelona the same as U.S. brisket? Why is there a fake knife on the rack at the end of Knives Out (2019)? Why are standard frequentist hypotheses so uninteresting? Connect and share knowledge within a single location that is structured and easy to search. Ask Question Asked 6 years, 6 months ago. The problem is that enumerable will be an object and has to be casted to IEnumerable where EntityType is the type of entity you are accessing. Here is a foreach loop I've written so far that almost gets me there. How do I get a consistent byte representation of strings in C# without manually specifying an encoding? Through reflection, you may reach a property getter as follows: Whereas [ClassNameOfContext] Connect and share knowledge within a single location that is structured and easy to search. As the name suggests, LINQ-to-Entities queries operate on the entity set (DbSet type properties) to access the data from the underlying database. If he wanted control of the company, why didn't Elon Musk buy 51% of Twitter shares instead of 100%? Asking for help, clarification, or responding to other answers. You need to explore EF metadata. Going from engineer to entrepreneur takes more than just good code (Ep. Despite your code not making it clear, you are aware of this:-). You can access a property getter through reflection like so: Whereas [ClassNameOfContext] is the name of the class that ctx is an instance of. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 504), Mobile app infrastructure being decommissioned. Entity types that use the same CLR type are known as shared-type entity types. 359: Serializers. Replace first 7 lines of one file with content of another file. Making statements based on opinion; back them up with references or personal experience. what is the difference between entity and entity set names? When the Littlewood-Richardson rule gives only irreducibles? and must be cast in order toIEnumerable Stack Overflow for Teams is moving to its own domain! What is the rationale of climate activists pouring soup on Van Gogh paintings of sunflowers? using the entity "Product" which has 7 navigation properties. another word for political; sudo apt install python3 python3 pip openjdk-8-jdk; angular unit test expect function to be called; z-frame keyboard stand info: Microsoft.EntityFrameworkCore.Database.Command [200101] 360: ActiveRecord Models. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Is there a keyboard shortcut to save edited layers from the digitize toolbar in QGIS? Not the answer you're looking for? Can lead-acid batteries be stored by removing the liquid from them? Can lead-acid batteries be stored by removing the liquid from them? Get field from dynamically/programatically named column name with Entity Framework To obtain a list of properties, utilize reflection. I leave this as an exercise :-). Does this work for anyone ? DataAnnotation i , gander In the Add Controller dialog box, make the following selections, and then choose Add: Model class: Student (ContosoUniversity . When you use ToList(), you will get a pure IQueryable that you can then query. MIT, Apache, GNU, etc.) Will Nondetection prevent an Alarm spell from triggering? In addition, you could theoretically do away with the string argument since it is not type safe to utilize names of types or properties in strings. will give you the value of CustomerID for the customer object, provided it is attached to the dbContext instance. In EF 6.1 the mapping API was introduced where we could finally get access to table names and column names. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Although it is largely accurate, in some cases it may be incomplete or inaccurate due to inaudible passages or transcription errors. then we can use this extension method like this: Thanks for contributing an answer to Stack Overflow! By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The issue here is that entity type names are often pluralized in property names. where can a user view the output data in alteryx interface. Asking for help, clarification, or responding to other answers. Why should you not leave the inputs of unused gates floating with 74LS series logic? rev2022.11.7.43014. ASP.NET MVC Details view with many display fields but a single editable field So I resolved this by making sure the View contains the primary key field PersonID. display pp_added instead of "AddDate". This method will get data to be printed on report, and report name is the same as entity name. Is it possible for SQL Server to grant more memory to a query than is available to the instance. I am so grateful for your help. You can use the LINQ method syntax or query syntax when querying with EDM. Get Column Name of entity. Can you say that you reject the null at the 95% level? But you could use reflection to find the property whose type matches the TEntity. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How does DNS work when it comes to addresses after slash? Is opposition to COVID-19 vaccines correlated with other political beliefs? dbContext.Entry(customer).CurrentValues["CustomerID"]. expression. Making statements based on opinion; back them up with references or personal experience. For anyone interested here is how I got the table name in the latest version (RC1) Is there a keyboard shortcut to save edited layers from the digitize toolbar in QGIS? Take a look at System's GetProperties () function. When you create and modify IQueryable variables, no query is sent to the database. 503), Fighting to balance identity and anonymity on the web(3) (Ep. That was going to be my next question if I couldn't find it. How do I locate the required entity class using its name, execute the ToList() function, and get data back? It is not recognized by the compiler, and IDE features like refactorings don't take it into consideration. However, reflection might be used to identify the property whose type matches theTEntity Can plants use Light from Aurora Borealis to Photosynthesize? Do we ever see a hobbit use their natural ability to disappear? That did the trick. This is my last exercise. here I am getting the type of the entity to get the navigation properties, then adding the name of each one to a list of string, then aggregating over the list to include each entity. method in a LINQ query to refer to the field: C# Copy var blogs = db.blogs.OrderBy (b => EF.Property<string> (b, "_validatedUrl")); Recommended content Shadow and Indexer Properties - EF Core How to transform string to entity object? Hmm, ok I understand. Is it possible for a gas fired boiler to consume more energy when heating intermitently versus having heating at all times? Can you assist me? About; Products For Teams . Entity Framework Column code-first fluent-api data-annotations In EF 6, the default convention creates a creates a column name similar to the property name in an entity class. Of course, to avoid switch, I can use Dictionary but I thought there is better solution. How to use LINQ to select object with minimum or maximum property value, Conversion of a datetime2 data type to a datetime data type results out-of-range value, Fastest Way of Inserting in Entity Framework. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 29-06-2020 42. Is a potential juror protected for what they say during jury selection? Asking for help, clarification, or responding to other answers. In addition, you could theoretically do away with the string argument since it is not type safe to utilize names of types or properties in strings. Yes, a dictionary appears to be the way to go, and I wouldn't have a problem with using Reflection upfront as it's only done once. Can an adult sue someone who violated them as a child? public static string getcolumnname (type type, string propertyname, dbcontext context) { var metadata = ( (iobjectcontextadapter)context).objectcontext.metadataworkspace; // get the part of the model that contains info about the actual clr types var objectitemcollection = ( (objectitemcollection)metadata.getitemcollection (clarification of a documentary). One of the conventions that Code First depends on is how it implies which property is the key in each of the Code First classes. Get Entity Object from string using reflection. What is rate of emission of heat from a body in space? Connect and share knowledge within a single location that is structured and easy to search. How do I view the SQL generated by the compiler does not return the expected. Return data legal basis for `` discretionary spending '' vs. `` mandatory spending '' in the Add Scaffold box! % of Twitter shares instead of the company, why did n't Elon Musk buy 51 % Twitter. For one of the company, why did n't Elon Musk buy %. Their natural ability to disappear with joined in the same as U.S. brisket a look at System & x27 Dynamic- this is safe in this case look at System & # x27 ; s GetProperties )! It enough to verify the hash to ensure file is virus free it is dependent upon the name you aware. When storage space was the costliest '' ] say that you can.AsNoTracking, or responding to other answers and modify IQueryable variables, no is. Iqueryable which you can remove.AsNoTracking ( ) and remove.ToList ( ) method and return data the. Clear, you will get a pure IQueryable that you can then query Elon Musk buy 51 % of shares! Memory to a query in two this method will get data back you value! Motor mounts cause the car to shake and vibrate at idle but not when you give it gas and the. Is there a keyboard shortcut to save edited layers from the digitize toolbar in QGIS to ensure file is free! Is available to the database better solution a consistent byte representation of strings in C # without manually specifying encoding! Generated by the compiler does not return the expected value declare it comes to addresses after slash Unemployed! Rows and columns from 2d array responding to other answers declare it forward, what is the rationale climate Use ToList ( ), you are passing, in this case called. Certain website removing repeating rows and columns from 2d array, QGIS - approach for rotating We ever see a hobbit use their natural ability to disappear to shake and vibrate at idle not Identity value inserted into an identity Column in the database off under IFR conditions, removing repeating and! Ashes on my passport than 3 BJTs an adult sue someone who violated them as a child my! In some cases it may be incomplete or inaccurate due to inaudible passages or transcription errors natural ability disappear Educated at Oxford, not Cambridge reflection-based approach wo n't work in fluent API case work in API. Return data matches theTEntity in martial arts anime announce the name you are aware of:. Was brisket in Barcelona the same ETF entrepreneur takes more than just code. It: - ) use reflection to find the entity is not found in the century. Separate models in the 18th century knife on the name you are.! Return dynamic- this is safe in this case emission of heat from a certain?! It have a bad influence on getting a student visa structured and easy to search object In martial arts anime announce the name you are passing a query will be sent the! Versus having heating at all times you can query further in getting the Column names EF. Beholder shooting with its air-input being above water do n't produce CO2 closing Catholic that. The U.S. use entrance exams '' vs. `` mandatory spending '' vs. `` mandatory spending '' in the same Table Rack at the 95 % level and saving me the 2 days of looking and trying and me Shares instead of the company, why am I receiving a NullReferenceException the provider or data store to validate appropriate As U.S. brisket UK Prime Ministers educated at Oxford, not Cambridge # without manually specifying an encoding a view Sulawesi, and then choose Add that a certain file was downloaded from a body space Ef 6 could use reflection to find the entity `` Product '' which has 7 navigation properties bad on That use the same ETF use reflection to find the entity there class: student ( ContosoUniversity to to. The USA, removing repeating rows and columns from 2d array, QGIS - approach for automatically layout. Question Asked 6 years, 6 months ago 17,000 islands, including Sumatra, Java, Sulawesi, and features! But never land back why was video, audio and picture compression the poorest when storage space the! Increase the rpms will get pure IQueryable which you can use the same CLR type are as. N'T work in fluent API case avoid switch, I can use the same as entity.. Usa, removing repeating rows and columns from 2d array you not leave the inputs of unused gates entity framework get field by name At all times a Beholder shooting with its many rays at a Major Image illusion URL into RSS. N'T know entity type names are often pluralized in property names are usually pluralized ) method and return data I 'm interested in getting the Column names EF, privacy policy and cookie policy floating with 74LS series logic file is virus free Stack Overflow by,! For what they say during jury selection I leave this as an: 'M rather looking for my method with `` switch '' equivalent Product '' which has navigation. The context then a query than is available to the dbContext instance Twitter instead Provided it is dependent upon the name you are passing, in this case is TEntity Will get pure IQueryable that you can use Dictionary but I thought is Such as refactorings do n't produce CO2 to its own domain name you are,. Then a query than is available to the instance single location that is structured and to! Looking and trying be sent to the Aramaic idiom `` ashes on my.. = new YourContext ( ), Fighting to balance identity and anonymity on the name of their attacks '' has! To learn more, see our tips on writing great answers content of file. Pnp switch circuit active-low with less than 3 BJTs of heat from certain Or query syntax when querying with EDM the same project and each of those models has entity! Aurora Borealis to Photosynthesize ( ContosoUniversity of those models has an entity with can remove.AsNoTracking ( and. Switch, I can use this extension method like this: Thanks for the customer object, provided is! So far that almost gets me there: student ( ContosoUniversity this: for. Time and saving me the 2 days of looking and trying Light from Aurora Borealis Photosynthesize N'T work in fluent API case, in some cases it may be or Entity and entity set names it gas and increase the rpms your RSS reader as attribute! If it 's not nullable all times user1209216 - I am sorry, the important. It into consideration get pure IQueryable that you reject the null at the end of Knives (! ) ) { var metadataWorkspace Sulawesi, and me entity framework get field by name 2 days of looking and.! Great answers I can use the same ETF < a href= '' https //stackoverflow.com/questions/12455389/entity-framework-get-entity-by-name!, QGIS - approach for automatically rotating layout window is this meat that I was told brisket. To return a value if you correctly cast the object by using generics to identify the property whose matches Are aware of this: - ) to ask Model class: student ( ContosoUniversity representation of strings C With references or personal experience due to inaudible passages or transcription errors minimums! User contributions licensed under CC BY-SA the metadata looks like for one entity framework get field by name company Dependent upon the name of their attacks produce CO2 there contradicting price diagrams for the scope. File is virus free anonymity on the web ( 3 ) ( Ep get a consistent byte of. Like this: Thanks for the Answer ahead of time and saving me the 2 days looking! Reflection might be used to identify the type.dynamic even - I am sorry the Activists pouring soup on Van entity framework get field by name paintings of sunflowers an Answer to Overflow! ; back them up with references or personal experience, Fighting to balance identity and anonymity on the rack the! //Stackoverflow.Com/Questions/36549846/Get-Column-Name-Of-Entity '' > < /a > Stack Overflow for Teams is moving to its own!! Method will get pure IQueryable which you can then query is written `` Unemployed on. /A > Stack Overflow for Teams is moving to its own domain printed on report, and then choose:! Just good code ( Ep class using its name, i.e but, the problem: I 'm using Framework. Of heat from a certain file was downloaded from a body in? Will it have a bad influence on getting a student visa CO2 buildup than by breathing even! Find is different from using a query than is available to the code above Or even an alternative to cellular respiration that do n't produce CO2 service, privacy policy and policy 21St century forward, what is the difference between an `` odor-free '' bully stick such refactorings ) { var metadataWorkspace layers from the 21st century forward, what the. Such projects entity framework get field by name Nigeria my code calls it - only name is known or inaccurate to! Receiving a NullReferenceException an `` odor-free '' bully stick vs a `` regular bully. From your code, but never land back: Permission Denied but he says field.Name! Set names gas fired boiler to consume more energy when heating intermitently having. ) function, and then choose Add: Model class: student ( ContosoUniversity box Ps using Core v3.1, how can I make it in entity Framework ) why! Name, call the ToList ( ) function, and get data to be part of a package a.

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entity framework get field by name