调试器可视化工具 [Visual Studio 2010] - System.Linq.Expressions.Expression - 不显示放大镜

发布于 2024-10-13 17:05:20 字数 1329 浏览 8 评论 0原文

我一直在尝试为 linq 表达式构建调试器可视化工具。

我知道已经存在一个，但我想创建自己的并添加附加功能。

我制作了这个快速原型。放大镜不会显示；但是，如果我将一行代码更改为“Target = typeof(System.String)”，则会显示放大镜。

任何帮助将不胜感激。

using System.IO;
using System.Windows.Forms;
using Microsoft.VisualStudio.DebuggerVisualizers;

[assembly: System.Diagnostics.DebuggerVisualizer(
    typeof(VisualizerPrototype.MyDebuggerVisualizer),
    typeof(VisualizerPrototype.MyDebuggerVisualizerObjectSource),
    Target = typeof(System.Linq.Expressions.Expression),
    Description = "My Debugger Visualizer")]
namespace VisualizerPrototype
{
    public class MyDebuggerVisualizer : DialogDebuggerVisualizer
    {
        protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
        {
            var text = string.Empty;
            using (var sr = new StreamReader(objectProvider.GetData()))
            {
                text = sr.ReadToEnd();
            }

            MessageBox.Show(text);
        }
    }

    public class MyDebuggerVisualizerObjectSource : VisualizerObjectSource
    {
        public override void GetData(object target, System.IO.Stream outgoingData)
        {
            var sw = new StreamWriter(outgoingData);
            sw.WriteLine("YO");
            sw.Flush();
        }
    }
}

原文

I have been trying to build a debugger visualizer for a linq Expression.

I know one exists already, but I would like to create my own and add additional functionality.

I made this quick prototype.
The magnifying glass will not show up; however, if I change the one line of code to "Target = typeof(System.String)", the magnifying glass shows up.

Any help would be appreciated.

using System.IO;
using System.Windows.Forms;
using Microsoft.VisualStudio.DebuggerVisualizers;

[assembly: System.Diagnostics.DebuggerVisualizer(
    typeof(VisualizerPrototype.MyDebuggerVisualizer),
    typeof(VisualizerPrototype.MyDebuggerVisualizerObjectSource),
    Target = typeof(System.Linq.Expressions.Expression),
    Description = "My Debugger Visualizer")]
namespace VisualizerPrototype
{
    public class MyDebuggerVisualizer : DialogDebuggerVisualizer
    {
        protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
        {
            var text = string.Empty;
            using (var sr = new StreamReader(objectProvider.GetData()))
            {
                text = sr.ReadToEnd();
            }

            MessageBox.Show(text);
        }
    }

    public class MyDebuggerVisualizerObjectSource : VisualizerObjectSource
    {
        public override void GetData(object target, System.IO.Stream outgoingData)
        {
            var sw = new StreamWriter(outgoingData);
            sw.WriteLine("YO");
            sw.Flush();
        }
    }
}

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香草可樂 2024-10-20 17:05:20

对于将来读到这篇文章的人来说，我发现了问题的根源。
调试器可视化工具的目标类型必须是运行时类型而不是继承类型。

Target = typeof(System.Linq.Expressions.ConstantExpression)
Expression expr = Expression.Constant(1); //visualizer shows up

Target = typeof(System.Linq.Expressions.Expression)
Expression expr = Expression.Constant(1); //visualizer doesn't show up

For anybody reading this in the future, I discovered the source of my problem.
The target type for a debugger visualizer must be the runtime type and not an inherited type.

Target = typeof(System.Linq.Expressions.ConstantExpression)
Expression expr = Expression.Constant(1); //visualizer shows up

Target = typeof(System.Linq.Expressions.Expression)
Expression expr = Expression.Constant(1); //visualizer doesn't show up

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