Compiler Error CS1946

An anonymous method expression cannot be converted to an expression tree.

An anonymous method represents a set of statements but an expression tree must not contain a statement. Therefore an anonymous method cannot be represented by an expression tree.

To correct this error

  1. Change the anonymous method to a lambda expression.


The following example generates CS1946:

// cs1946.cs  
using System;  
    using System.Linq.Expressions;  

    public delegate void D();  

    class Test  
        static void Main()  
            Expression<D> tree = delegate() { }; //CS1946  
            // Try using a lambda expression instead.  
            // Expression<D> tree = (x) => x + 1;  

See Also

Anonymous Methods
Expression Trees