Compiler Error CS0759

No defining declaration found for implementing declaration of partial method 'method'.

A partial method must have a defining declaration that defines the signature (name, return type and parameters) of the method. The implementation or method body is optional.

To correct this error

• Provide a defining declaration for the partial method in the other part of a partial class or struct.

Example

The following example generates CS0759:

using System;

namespace CS0759
{
    public partial class PartialClass
    {
        // The following method defines the implementation of the partial method.
        // Compiler error CS0759 results when the implementation declaration is 
        // present but the signature definition is not.
        partial void Part() 
        {
            Console.WriteLine("Method implementation");
        }

        public static void Main()
        {
            PartialClass pc = new PartialClass();
            pc.Part();
        }
    }

    //// Uncomment the following class to resolve the error.
    //public partial class PartialClass
    //{
    //    // The following method defines the signature of the partial method.
    //    partial void Part();
    //}
}

See Also

Reference

Partial Classes and Methods (C# Programming Guide)

Change History

Date	History	Reason
August 2009	Expanded the example.	Customer feedback.