扩展方法

static class ExceptionHelpers
{
    public static int LineNumber(this Exception ex)
    {
        int n;
        int i = ex.StackTrace.LastIndexOf(" ");
        if (i > -1)
        {
            string s = ex.StackTrace.Substring(i + 1);
            if (int.TryParse(s, out n))
                return n;
        }
        return -1;
    }
}

使用

try
{
    throw new Exception("A new error happened");
}
catch (Exception ex)
{
    //If error in exception LineNumber() will be -1
    System.Diagnostics.Debug.WriteLine("[" + ex.LineNumber() + "] " + ex.Message);
}

如果您需要的行号不仅仅是从Exception中获得的格式化堆栈跟踪。你可以使用StackTrace类:

try
{
    throw new Exception();
}
catch (Exception ex)
{
    // Get stack trace for the exception with source file information
    var st = new StackTrace(ex, true);
    // Get the top stack frame
    var frame = st.GetFrame(0);
    // Get the line number from the stack frame
    var line = frame.GetFileLineNumber();
}

请注意，这仅在程序集有pdb文件可用时才有效。

扩展方法

static class ExceptionHelpers
{
    public static int LineNumber(this Exception ex)
    {
        int n;
        int i = ex.StackTrace.LastIndexOf(" ");
        if (i > -1)
        {
            string s = ex.StackTrace.Substring(i + 1);
            if (int.TryParse(s, out n))
                return n;
        }
        return -1;
    }
}

使用

try
{
    throw new Exception("A new error happened");
}
catch (Exception ex)
{
    //If error in exception LineNumber() will be -1
    System.Diagnostics.Debug.WriteLine("[" + ex.LineNumber() + "] " + ex.Message);
}

如果生成异常的库是用调试符号编译的，那么行号将包含在堆栈跟踪中。这可以是一个单独的文件(*.pdb)，也可以嵌入到库中。

对于.NET Core、.NET 5及更高版本，要在发布版本中拥有完整的异常行号，请按如下方式配置项目:

<PropertyGroup>    
  <DebugSymbols>true</DebugSymbols>
  <DebugType>embedded</DebugType>

    <!-- Only enable the following if the line numbers mismatch -->
    <!--<Optimize>false</Optimize>-->
    
    <!--
      Additional properties which may impact how printed line numbers match the source code line numbers are listed here:
      https://learn.microsoft.com/en-us/dotnet/core/run-time-config/compilation
    -->
</PropertyGroup>

上面的配置将在构建的文件中直接包含调试符号，这些符号可以作为块发布。

上面的替代方法是将调试包与主要的nuget包一起恢复，目前还不支持:https://github.com/NuGet/Home/issues/9667

现在获取异常行号:

try
{
    throw new Exception();
}
catch (Exception ex)
{
    // Get stack trace for the exception with source file information
    var st = new StackTrace(ex, true);
    // Get the top stack frame
    var frame = st.GetFrame(0);
    // Get the line number from the stack frame
    var line = frame.GetFileLineNumber();
}

如果你的堆栈跟踪大于1，它应该是:

var st = new StackTrace(es, true);
// Get the top stack frame
var frame = st.GetFrame(st.FrameCount - 1);

//从栈帧中获取行号 var line = frame.GetFileLineNumber();

看看这个

StackTrace st = new StackTrace(ex, true);
//Get the first stack frame
StackFrame frame = st.GetFrame(0);

//Get the file name
string fileName = frame.GetFileName();

//Get the method name
string methodName = frame.GetMethod().Name;

//Get the line number from the stack frame
int line = frame.GetFileLineNumber();

//Get the column number
int col = frame.GetFileColumnNumber();