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Aug 14, 2020
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README-Appendix-E.md

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IndexColumnAttribute for EntityFramework Core

Appendix E - If you run into a compile error CS0104...

If you run into a compile error CS0104 "'Index' is an ambiguous reference between 'Toolbelt.ComponentModel.DataAnnotations.Schema.IndexAttribute' and 'Microsoft.EntityFrameworkCore.IndexAttribute'" in your project that has to use the old version of this package (ver.3.x or before),

using Microsoft.EntityFrameworkCore;
using Toolbelt.ComponentModel.DataAnnotations.Schema;

public class Foo {
  ...
  [Index] // 👈 CS0104 "'Index' is an ambiguous reference...
  public int Bar { get; set; }
}

you can resolve this compile error by the following workaround steps.

  1. Remove using namespace directive.
// 👇 Remove this line...
using Toolbelt.ComponentModel.DataAnnotations.Schema;
  1. Insert using alias = full qualified name directive to add the alias of Toolbelt.ComponentModel.DataAnnotations.Schema.IndexAttribute class.
// 👇 Insert this line instead to add the alias.
using IndexColumnAttribute =
  Toolbelt.ComponentModel.DataAnnotations.Schema.IndexAttribute;
  1. Replace [Index] to [IndexColumn].
  ...
  // 👇 Replace [Index] to [IndexColumn]
  [IndexColumn] 
  public int Bar { get; set; }
  ...

Finally, the example code will be as below, and you can compile it as expected.

using Microsoft.EntityFrameworkCore;
using IndexColumnAttribute =
    Toolbelt.ComponentModel.DataAnnotations.Schema.IndexAttribute;

public class Foo {
  ...
  [IndexColumn]
  public int Bar { get; set; }
}