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Compiler Error CS1706

Expression cannot contain anonymous methods or lambda expressions

You cannot insert an anonymous method inside an expression.

To correct this error

  • Use a regular delegate in the expression.

The following example generates CS1706.

// CS1706.cs
using System;

delegate void MyDelegate();
class MyAttribute : Attribute
    public MyAttribute(MyDelegate d) { }

// Anonymous Method in Attribute declaration is not allowed.
[MyAttribute(delegate{/* anonymous Method in Attribute declaration */})]  // CS1706
class Program