获取主题列表

Question

我想列出所有正在运行的线程，但不是使用List<>类。我想动态观察正在运行的线程。我怎么能这样做？

Answer 1

using System.Diagnostics;

ProcessThreadCollection currentThreads = Process.GetCurrentProcess().Threads;

foreach (ProcessThread thread in currentThreads)    
{
   // Do whatever you need
}

Answer 2

方法1：获取操作系统线程

这将获得操作系统线程列表：

ProcessThreadCollection currentThreads = Process.GetCurrentProcess().Threads;

foreach (ProcessThread thread in currentThreads)
{
}

方法2：获取托管线程

托管线程位于OS线程之上。 ID是不同的，理论上，不止一个托管线程可能位于单个操作系统线程之上（尽管我实际上没有观察到这一点）。

事实证明，获取托管线程比实际应该更加棘手。

方法2.1：获取托管线程的最简单代码

1. 查看Microsoft.Diagnostics.Runtime on GitHub。
2. 安装NuGet包CLR Memory Diagnostics (ClrMD)。

然后，您可以使用所述NuGet包附加到您自己的进程，并读取托管线程：

using Microsoft.Diagnostics.Runtime;

using (DataTarget target = DataTarget.AttachToProcess(
    Process.GetCurrentProcess().Id, 5000, AttachFlag.Passive))
{
    ClrRuntime runtime = target.ClrVersions.First().CreateRuntime();
    foreach (ClrThread thread in runtime.Threads)
    {
    }
}

方法2.2：如何通过堆栈跟踪搜索托管线程的示例

不幸的是，我无法通过线程名称搜索线程列表。

然而，一切都不会丢失：这里有一个如何创建托管线程的示例，然后通过在堆栈帧中搜索命名空间上的匹配项来查找它，然后打印出它的属性：

namespace MyTest
{
    int managedThreadId = 0;
    var task = Task.Run(
        () =>
        {
            // Unfortunately, cant see "Testing" anywhere in result returned
            // from NuGet package ClrMD ...
            Thread.CurrentThread.Name = "Testing";
            Thread.Sleep(TimeSpan.FromDays(1));
        });


    // ... so we look for our thread by the first word in this namespace.
    string startOfThisNamespace = this.GetType().Namespace.ToString().Split('.')[0]; // Is "MyTest".
    using (DataTarget target = DataTarget.AttachToProcess(Process.GetCurrentProcess().Id, 5000, AttachFlag.Passive))
    {
        ClrRuntime runtime = target.ClrVersions.First().CreateRuntime();

        foreach (ClrThread thread in runtime.Threads)
        {
            IList<ClrStackFrame> stackFrames = thread.StackTrace;

            List<ClrStackFrame> stackframesRelatedToUs = stackFrames
                .Where(o => o.Method != null && o.Method.ToString().StartsWith(startOfThisNamespace)).ToList();

            if (stackframesRelatedToUs.Count > 0)
            {
                Console.Write("ManagedThreadId: {0}, OSThreadId: {1}, Thread: IsAlive: {2}, IsBackground: {3}:\n", thread.ManagedThreadId, thread.OSThreadId, thread.IsAlive, thread.IsBackground);
                Console.Write("- Stack frames related namespace '{0}':\n", startOfThisNamespace);
                foreach (var s in stackframesRelatedToUs)
                {
                    Console.Write("  - StackFrame: {0}\n", s.Method.ToString());
                }
            }
        }
    }
}

您还可以通过在您创建的主题中保存ManagedThreadId来找到正确的匹配项，然后在runtime.Threads中查找相同的ID。

测试

使用以下所有组合进行测试：

• Visual Studio 2015 SP1
• .NET 4.5
• .NET 4.6.0
• .NET 4.6.1
• C＃5.0
• C＃6.0

参考

请参阅ClrMd throws exception when creating runtime。

Answer 3

更新了代码以获取使用@Contango 的答案作为基础的所有堆栈跟踪的快照。您仍然需要安装 NuGet 包 CLR Memory Diagnostics (ClrMD)。此代码段还包含用于获取线程名称的额外代码，但如果您只需要堆栈跟踪，则不需要这样做。

using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using Microsoft.Diagnostics.Runtime;

namespace CSharpUtils.wrc.utils.debugging
{
    public static class StackTraceAnalysis
    {
        public static string GetAllStackTraces()
        {
            var result = new StringBuilder();
            
            using (var target = DataTarget.CreateSnapshotAndAttach(Process.GetCurrentProcess().Id))
            {
                var runtime = target.ClrVersions.First().CreateRuntime();

                // We can't get the thread name from the ClrThead objects, so we'll look for
                // Thread instances on the heap and get the names from those.    
                var threadNameLookup = new Dictionary<int, string>();
                foreach (var obj in runtime.Heap.EnumerateObjects())
                {
                    if (!(obj.Type is null) && obj.Type.Name == "System.Threading.Thread")
                    {
                        var threadId = obj.ReadField<int>("m_ManagedThreadId");
                        var threadName = obj.ReadStringField("m_Name");
                        threadNameLookup[threadId] = threadName;
                    }
                }

                foreach (var thread in runtime.Threads)
                {
                    threadNameLookup.TryGetValue(thread.ManagedThreadId, out string threadName);
                    result.AppendLine(
                        $"ManagedThreadId: {thread.ManagedThreadId}, Name: {threadName}, OSThreadId: {thread.OSThreadId}, Thread: IsAlive: {thread.IsAlive}, IsBackground: {thread.IsBackground}");
                    foreach (var clrStackFrame in thread.EnumerateStackTrace())
                        result.AppendLine($"{clrStackFrame.Method}");
                }
            }

            return result.ToString();
        }
    }
}