无法将 MathNet.Numerics.LinearAlgebra.Matrix 定义为 Const？

Question

Here is the C# code :

const MathNet.Numerics.LinearAlgebra.Matrix<Complex32> ket_Zero =
   MathNet.Numerics.LinearAlgebra.Matrix<Complex32>.Build.DenseOfRowMajor(2, 1,
       new MathNet.Numerics.Complex32[] {
           new MathNet.Numerics.Complex32(1,0),
           new MathNet.Numerics.Complex32(0,0)
       } );

It's ok if I don't put the const keyword. But if I want to defined this as a constant, Microsoft Visual Studio rejects with

Error Code CS0133 = The expression being assigned to 'Form1.ket_Zero' must be constant.

I also tried replacing const with readonly but won't work too.
How can I define matrices as constants?

Answer 1

Here is the documentation from MSDN on what can be defined as const. I will quote the required part.

Only the C# built-in types (excluding System.Object) may be declared as const. User-defined types, including classes, structs, and arrays, cannot be const.

In your case, you are trying to define MathNet.Numerics.LinearAlgebra.Matrix<Complex32> as const but it is used declared type therefore can not be const