NLog 自定义 LayoutRenderer 用于范围缩进

Question

任何人都可以为我提供一个非常示例的 nlog 自定义布局渲染器吗？

我想在记录时进行缩进，例如，

如果我从方法 C 调用方法 B，则

文本日志文件将如下所示：

Inside Method C
       Inside Method B

等等。

Answer 1

这是：

[LayoutRenderer("IndentationLayout")]
public sealed class IndentationLayoutRenderer : LayoutRenderer
{
    // Value to substract from stack count
    private uint _ignore = 12;

    // Value to pad with.
    private string _ipadding = "| ";

    /// <summary>Set the number of (top) stackframes to ignore</summary>
    public uint Ignore
    {
        get { return _ignore; }
        set { _ignore = value; }
    }

    /// <summary>Set the padding value</summary>
    public string IndentationPadding
    {
        get { return _ipadding; }
        set { _ipadding = value; }
    }

    protected override void Append(StringBuilder builder, LogEventInfo ev)
    {
        // Get current stack depth, insert padding chars.
        StackTrace st = new StackTrace();
        long indent = st.FrameCount;
        indent = indent > _ignore ? indent - _ignore : 0;
        for (int i = 0; i < indent; ++i)
        {
            builder.Append(_ipadding);
        }
    }
}

注册：

if(NLog.Config.ConfigurationItemFactory.Default.LayoutRenderers.AllRegisteredItems.ContainsKey(
                "IndentationLayout"))
                return;

NLog.Config.ConfigurationItemFactory.Default.LayoutRenderers.RegisterDefinition("IndentationLayout", typeof(IndentationLayoutRenderer));

Answer 2

使用 NLog 5.0.5，您可以使用 ${scopeindent}

${scopeindent}${message}

Logger.Info("Hello No Scope");              // Will not be indented

using (NLog.ScopeContext.PushNestedState("First Scope"))
{
   Logger.Info("Hello First Scope");        // Will be indented once
   await InnerOperationAsync();
}

static async Task InnerOperationAsync()
{
    using (NLog.ScopeContext.PushNestedState("Second Scope"))
    {
        Logger.Info("Hello Second Scope");   // Will be indented twice
        await Task.Yield();
    }
}