CS1503 无法将矩阵转换为 MatrixOrder

Question

I'm quite new to C# programming. I would like to run a simple test in MVS for Matrix calculation code as attached.

However I obtained the following errors:

1) Error CS1503 Argument 2: cannot convert from 'System.Drawing.Drawing2D.Matrix' to 'System.Drawing.Drawing2D.MatrixOrder'

2) Error CS0019 Operator '*' cannot be applied to operands of type 'Matrix' and 'Matrix'

I had tried looking for solutions, but couldn't resolve this errors.

Target Framework: .Net Framework 4.7.2 Output Type: Console Application

Please advise. Thank You.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Drawing.Drawing2D;

namespace Project2

{
    public class MatrixCalculation
    {
        static void Main()
        {
        }

        private void MultiplicationExample()
        {
            Matrix matrix1 = new Matrix(5, 10, 15, 20, 25, 30);
            Matrix matrix2 = new Matrix(2, 4, 6, 8, 10, 12);

            // matrixResult is equal to (70,100,150,220,240,352) 
          Matrix matrixResult = Matrix.Multiply(matrix1, matrix2);

            // matrixResult2 is also
            // equal to (70,100,150,220,240,352) 
            Matrix matrixResult2 = matrix1 * matrix2;
        }
    }
}

Answer 1

It is because you are using a System.Drawing.Drawing2D.Matrix instead of a System.Windows.Media.Matrix .

The System.Drawing.Drawing2D.Matrix.Multiply method takes one or two parameters. The first one being a Matrix and the optional second one a MatrixOrder .

Remove this line:

using System.Drawing.Drawing2D;

If the error persists, the you're probably referencing the wrong assembly.

If you're using Visual Studio

1. Right click your project's references
2. Click on ' Add Reference '
3. Search for WindowsBase and select it

Answer 2

If you are using the namespace System.Drawing.Drawing2D , you could do the multiplication like the following:

matrix1.Multiply(matrix2); //matrix1 will have the result.

For reference: https://docs.microsoft.com/en-us/dotnet/api/system.drawing.drawing2d.matrix.multiply?view=netframework-4.8