VS custom visualizer中`new AdhocWorkspace()`之后的“此函数要求所有线程求值”

maps expressions in an expression tree to Roslyn syntax nodes ,以便为表达式树生成代码。语法树生成的一部分是调用 AdhocWorkspace 构造器。

VisualizerDevelopmentHost ,一切正常:

using Microsoft.VisualStudio.DebuggerVisualizers;
using System;
using System.Linq.Expressions;

namespace _testVisualizer {
    class Program {
        [STAThread]
        static void Main(string[] args) {
            Expression<Func<bool>> expr = () => true;
            var data = new TestVisualizerData(expr);
            var visualizerHost = new VisualizerDevelopmentHost(data, typeof(TestVisualizer));
            visualizerHost.ShowVisualizer();

            Console.ReadKey(true);
        }
    }
}

expr ,单击放大镜图标并选择我的可视化工具),我得到以下消息:

无法对正在调试的进程执行功能评估。

函数求值需要运行所有线程。

我已确定以下因素触发了错误:

workspace = new AdhocWorkspace();

分配给 workspace 我的场地 Mapper source ).

为什么打电话给警察 AdhocWorkspace 构造函数触发此警告?我怎样才能解决这个问题?

这是一个演示问题的MCVE:

using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio.DebuggerVisualizers;
using System;
using System.Diagnostics;
using System.IO;
using System.Windows;
using System.Windows.Controls;

[assembly: DebuggerVisualizer(typeof(_testVisualizer.TestVisualizer), typeof(_testVisualizer.TestVisualizerDataObjectSource), Target = typeof(System.Linq.Expressions.Expression), Description = "Test Visualizer")]

namespace _testVisualizer {
    public class TestVisualizer : DialogDebuggerVisualizer {
        protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider) {
            var data = (TestVisualizerData)objectProvider.GetObject();
            var txt = new TextBlock();
            txt.SetBinding(TextBlock.TextProperty, "Status");
            var window = new Window {
                DataContext = data,
                Content = txt
            };
            window.ShowDialog();
        }
    }

    [Serializable]
    public class TestVisualizerData {
        public TestVisualizerData() { }
        public TestVisualizerData(System.Linq.Expressions.Expression expr) {
            var workspace = new AdhocWorkspace();
            Status = "Success";
        }
        public string Status { get; set; }
    }

    public class TestVisualizerDataObjectSource : VisualizerObjectSource {
        public override void GetData(object target, Stream outgoingData) {
            var expr = (System.Linq.Expressions.Expression)target;
            var data = new TestVisualizerData(expr);
            base.GetData(data, outgoingData);
        }
    }
}