C# Error CS0761 – Partial method declarations of ‘{0}’ have inconsistent constraints for type parameter ‘{1}’

C# Error

CS0761 – Partial method declarations of ‘{0}’ have inconsistent constraints for type parameter ‘{1}’

Reason for the Error & Solution

Partial method declarations of ‘method<T>’ have inconsistent type parameter constraints.

If a partial method has an implementation, the generic type constraint must be identical to the constraint defined on the method signature.

To correct this error

1. Make the generic type constraints identical on each part of the partial method.

Example

The following code generates CS0761:

// cs0761.cs  
using System;  
  
public partial class C  
{  
    partial void Part<T>() where T : class;  
    partial void Part<T>() where T : struct // CS0761  
    {  
    }  
  
    public static int Main()  
    {  
        return 1;  
    }  
}