如何将StackFrame集合转换为字符串？

Question

我有一个IEnumerable<System.Diagnostics.StackFrame> frames存储一些自定义的StackFrame。 我想将其转换为像StackTrace.ToString()格式的字符串类型。 例如：

at TestStackTrace.Form1.button2_Click(Object sender, EventArgs e) in 
d:\Programming\temp\TestStackTrace\TestStackTrace\Form1.cs:line 66 
    at System.Windows.Forms.Control.OnClick(EventArgs e) 
    at System.Windows.Forms.Button.OnClick(EventArgs e) 
    at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) 

Answer 1

我已经使用Microsoft Reference Source反映（mscorlib）。 system\diagnostics\stacktrace.cs的代码，看看发生在那个ToString()方法将该StackFrames转换为字符串。所以，有了这个，我可以写一个没有依赖性的函数。

public static string StackFramesToString(this StackFrame[] frames, int numMethodsToSkip = 0) 
{ 
    bool displayFilenames = true; // we'll try, but demand may fail 
    String word_At = "at"; 
    String inFileLineNum = "in {0}:line {1}"; 

    bool fFirstFrame = true; 
    StringBuilder sb = new StringBuilder(255); 
    for (int iFrameIndex = 0; iFrameIndex < frames.Count(); iFrameIndex++) 
    { 
     StackFrame sf = GetFrame(iFrameIndex, frames, numMethodsToSkip); 
     MethodBase mb = sf.GetMethod(); 
     if (mb != null) 
     { 
      // We want a newline at the end of every line except for the last 
      if (fFirstFrame) 
       fFirstFrame = false; 
      else 
       sb.Append(Environment.NewLine); 

      sb.AppendFormat(CultureInfo.InvariantCulture, " {0} ", word_At); 

      Type t = mb.DeclaringType; 
      // if there is a type (non global method) print it 
      if (t != null) 
      { 
       sb.Append(t.FullName.Replace('+', '.')); 
       sb.Append("."); 
      } 
      sb.Append(mb.Name); 

      // deal with the generic portion of the method 
      if (mb is MethodInfo && ((MethodInfo)mb).IsGenericMethod) 
      { 
       Type[] typars = ((MethodInfo)mb).GetGenericArguments(); 
       sb.Append("["); 
       int k = 0; 
       bool fFirstTyParam = true; 
       while (k < typars.Length) 
       { 
        if (fFirstTyParam == false) 
         sb.Append(","); 
        else 
         fFirstTyParam = false; 

        sb.Append(typars[k].Name); 
        k++; 
       } 
       sb.Append("]"); 
      } 

      // arguments printing 
      sb.Append("("); 
      ParameterInfo[] pi = mb.GetParameters(); 
      bool fFirstParam = true; 
      for (int j = 0; j < pi.Length; j++) 
      { 
       if (fFirstParam == false) 
        sb.Append(", "); 
       else 
        fFirstParam = false; 

       String typeName = "<UnknownType>"; 
       if (pi[j].ParameterType != null) 
        typeName = pi[j].ParameterType.Name; 
       sb.Append(typeName + " " + pi[j].Name); 
      } 
      sb.Append(")"); 

      // source location printing 
      if (displayFilenames && (sf.GetILOffset() != -1)) 
      { 
       // If we don't have a PDB or PDB-reading is disabled for the module, 
       // then the file name will be null. 
       String fileName = null; 

       // Getting the filename from a StackFrame is a privileged operation - we won't want 
       // to disclose full path names to arbitrarily untrusted code. Rather than just omit 
       // this we could probably trim to just the filename so it's still mostly usefull. 
       try 
       { 
        fileName = sf.GetFileName(); 
       } 
       catch 
       { 
        // If the demand for displaying filenames fails, then it won't 
        // succeed later in the loop. Avoid repeated exceptions by not trying again. 
        displayFilenames = false; 
       } 

       if (fileName != null) 
       { 
        // tack on " in c:\tmp\MyFile.cs:line 5" 
        sb.Append(' '); 
        sb.AppendFormat(CultureInfo.InvariantCulture, inFileLineNum, fileName, sf.GetFileLineNumber()); 
       } 
      } 
     } 
    } 

    return sb.ToString(); 
} 


public static StackFrame GetFrame(int index, StackFrame[] frames, int numMethodsToSkip) 
{ 
    if ((frames != null) && (index < frames.Count()) && (index >= 0)) 
     return frames[index + numMethodsToSkip]; 

    return null; 
} 

Answer 2

使用stateprinter框架。它可以将对象图转换为字符串，甚至可以自动执行测试的断言部分。见https://github.com/kbilsted/StatePrinter/blob/master/doc/AutomatingUnitTesting.md

为了使字符串

string s = new Stateprinter().PrintObject(stackframe)