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Compiler Error CS1018 

Error Message

Keyword 'this' or 'base' expected

The compiler encountered an incomplete constructor declaration.

Example

The following example generates CS1018, and suggests several ways to resolve the error:

// CS1018.cs
public class C
{
}

public class a : C
{
    public a(int i)
    {
    }

    public a () :   // CS1018
    // possible resolutions:
    // public a () resolves by removing the colon
    // public a () : base() calls C's default constructor
    // public a () : this(1) calls the assignment constructor of class a
    {
    }

    public static int Main()
    {
        return 1;
    }
}
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