Unity错误：.ctor（）：方法主体为空

Question

This is a follow up question, coming from my last question about how to read and write from streams. The code that follows is the best answer from there:

    var byteData = Encoding.UTF8.GetBytes(data);

    var saveFileDialog = new SaveFileDialog
    {
        DefaultExt = "json",
        AddExtension = true,
        Filter = "JSON|*.json"
    };

    if (saveFileDialog.ShowDialog() != DialogResult.OK ||
        string.IsNullOrEmpty(saveFileDialog.FileName)) return;

    using (var saveFileDialogStream = saveFileDialog.OpenFile())
    {
        saveFileDialogStream.Write(byteData, 0, byteData.Length);
    }

The person who gave this to me confirms that it works outside of Unity, however when I try to have it run through Unity it throws the following error:

InvalidProgramException: Invalid IL code in System.Forms.SaveFileDialog: .ctor (): method body is empty

Any ideas? If you would like more details just ask. I'll do my best to flesh out my issue.

EDIT

Fixed first error it seems, but this uncovered a second, taking issue with the if statement seen above:

NullReferenceException: Object reference not set to an instance of an object

Answer 1

SaveFileDialog class requires .NET Framework 1.1 or superior in order to run, as per pointed out at the end page of the documentation you have linked to in your original post.

.NET Framework is one of several runtimes provided in the .NET environment. Problem is: Unity does not use .NET Framework as its main runtime - it uses Mono , which is a lighter and portable version of .NET runtime, designed to run in multiple platforms. This is how Unity is able to execute .NET/C# code in iOS, Android, PC, macOS, etc.

So basically you cannot use the SaveFileDialog class in Unity without messing around with plugins which provide platform-specific implementations of a dialog for saving files. You would have to write a plugin which could access that class, and even then, it would only be able to be executed in Windows-based platforms, as .NET Framework is a Windows-specific .NET runtime .