C# Error CS0686 – Accessor ‘{0}’ cannot implement interface member ‘{1}’ for type ‘{2}’. Use an explicit interface implementation.

C# Error

CS0686 – Accessor ‘{0}’ cannot implement interface member ‘{1}’ for type ‘{2}’. Use an explicit interface implementation.

Reason for the Error & Solution

Accessor ‘accessor’ cannot implement interface member ‘member’ for type ‘type’. Use an explicit interface implementation.

Suggested: This error can occur when implementing an interface that contains method names which conflict with the auto-generated methods associated with a property or event. The get/set methods for properties are generated as get_property and set_property, and the add/remove methods for events are generated as add_event and remove_event. If an interface contains either of these methods, a conflict occurs. To avoid this error, implement the methods using an explicit interface implementation. To do this, specify the function as:

Interface.get_property() { /* */ }  
Interface.set_property() { /* */ }  

Example 1

The following sample generates CS0686:

// CS0686.cs  
interface I  
{  
    int get_P();  
}  
  
class C : I  
{  
    public int P  
    {  
        get { return 1; }  // CS0686  
    }  
}  
// But the following is valid:  
class D : I  
{  
    int I.get_P() { return 1; }  
    public static void Main() {}  
}  

Example 2

This error can also occur when declaring events. The event construct automatically generates the add_event and remove_event methods, which could conflict with the methods of the same name in an interface, as in the following sample:

// CS0686b.cs  
using System;  
  
interface I  
{  
    void add_OnMyEvent(EventHandler e);  
}  
  
class C : I  
{  
    public event EventHandler OnMyEvent  
    {  
        add { }  // CS0686  
        remove { }  
    }  
}  
  
// Correct (using explicit interface implementation):  
class D : I  
{  
    void I.add_OnMyEvent(EventHandler e) {}  
    public static void Main() {}  
}