Question

I have a program using WPF in C# that uses the .NET 4 Framework (Not Client Profile), and it compiles a source file called “Source.txt”. However, whenever it compiles it I get this error “Error CS02345: The type or namespace name ‘Windows’ does not exist in the namespace ‘System’ (are you missing an assembly reference?)”. No file is created.

When I checked the lines from the Source.txt file, these are the ones that are giving the error:

using System.Windows.Linq;
using System.Windows;
using System.Windows.Input;
using System.Windows.Forms;
using System.Management;

This is the code I’m using to compile it from the main program:

CompilerParameters Params = new CompilerParameters();
            Params.GenerateExecutable = true;
            Params.ReferencedAssemblies.Add("System.dll");
            Params.OutputAssembly = ServerNameBox.Text;
            Params.CompilerOptions = " /target:winexe";    

            string Source = compileSource;
            CompilerResults Results = new CSharpCodeProvider().CompileAssemblyFromSource(Params, Source);

            if (Results.Errors.Count > 0)
            {
                foreach (CompilerError err in Results.Errors)
                    System.Windows.Forms.MessageBox.Show(err.ToString());
            }
            else System.Windows.Forms.MessageBox.Show("Sucessfully Compiled Program!");

As indicated in the code, I want this program to be compiled as a Windows Form / GUI Application (” /target:winexe”);

If this information is not sufficient, please ask.

Answer 1

As the error clearly hints, you need to add System.Windows.Forms.dll to ReferencedAssemblies.