打印MethodInfo中方法的完整签名

不幸的是,我不相信有一个内置的方法可以做到这一点。最好是通过调查MethodInfo类来创建自己的签名。

编辑:我刚刚做的

 MethodBase mi = MethodInfo.GetCurrentMethod();
 mi.ToString();

你得到

void main(system.string[])

这可能不是你想要的,但很接近。

这个怎么样?

 public static class MethodInfoExtension
        {
            public static string MethodSignature(this MethodInfo mi)
            {
                String[] param = mi.GetParameters()
                              .Select(p => String.Format("{0} {1}",p.ParameterType.Name,p.Name))
                              .ToArray();


            string signature = String.Format("{0} {1}({2})", mi.ReturnType.Name, mi.Name, String.Join(",", param));

            return signature;
        }
    }

    var methods = typeof(string).GetMethods().Where( x => x.Name.Equals("Compare"));

    foreach(MethodInfo item in methods)
    {
        Console.WriteLine(item.MethodSignature());
    }

这就是结果

Int32比较(字符串stra,Int32 索引a,字符串strb,int32 indexb,int32 长度,字符串比较 比较型)

更新日期:2018年3月22日

我重写了代码,添加了一些测试,并且 uploaded it to GitHub

回答

using System.Text;

namespace System.Reflection
{
    public static class MethodInfoExtensions
    {
        /// <summary>
        /// Return the method signature as a string.
        /// </summary>
        /// <param name="method">The Method</param>
        /// <param name="callable">Return as an callable string(public void a(string b) would return a(b))</param>
        /// <returns>Method signature</returns>
        public static string GetSignature(this MethodInfo method, bool callable = false)
        {
            var firstParam = true;
            var sigBuilder = new StringBuilder();
            if (callable == false)
            {
                if (method.IsPublic)
                    sigBuilder.Append("public ");
                else if (method.IsPrivate)
                    sigBuilder.Append("private ");
                else if (method.IsAssembly)
                    sigBuilder.Append("internal ");
                if (method.IsFamily)
                    sigBuilder.Append("protected ");
                if (method.IsStatic)
                    sigBuilder.Append("static ");
                sigBuilder.Append(TypeName(method.ReturnType));
                sigBuilder.Append(' ');
            }
            sigBuilder.Append(method.Name);

            // Add method generics
            if(method.IsGenericMethod)
            {
                sigBuilder.Append("<");
                foreach(var g in method.GetGenericArguments())
                {
                    if (firstParam)
                        firstParam = false;
                    else
                        sigBuilder.Append(", ");
                    sigBuilder.Append(TypeName(g));
                }
                sigBuilder.Append(">");
            }
            sigBuilder.Append("(");
            firstParam = true;
            var secondParam = false;
            foreach (var param in method.GetParameters())
            {
                if (firstParam)
                {
                    firstParam = false;
                    if (method.IsDefined(typeof(System.Runtime.CompilerServices.ExtensionAttribute), false))
                    {
                        if (callable)
                        {
                            secondParam = true;
                            continue;
                        }
                        sigBuilder.Append("this ");
                    }
                }
                else if (secondParam == true)
                    secondParam = false;
                else
                    sigBuilder.Append(", ");
                if (param.ParameterType.IsByRef)
                    sigBuilder.Append("ref ");
                else if (param.IsOut)
                    sigBuilder.Append("out ");
                if (!callable)
                {
                    sigBuilder.Append(TypeName(param.ParameterType));
                    sigBuilder.Append(' ');
                }
                sigBuilder.Append(param.Name);
            }
            sigBuilder.Append(")");
            return sigBuilder.ToString();
        }

        /// <summary>
        /// Get full type name with full namespace names
        /// </summary>
        /// <param name="type">Type. May be generic or nullable</param>
        /// <returns>Full type name, fully qualified namespaces</returns>
        public static string TypeName(Type type)
        {
            var nullableType = Nullable.GetUnderlyingType(type);
            if (nullableType != null)
                return nullableType.Name + "?";

            if (!(type.IsGenericType && type.Name.Contains('`')))
                switch (type.Name)
                {
                    case "String": return "string";
                    case "Int32": return "int";
                    case "Decimal": return "decimal";
                    case "Object": return "object";
                    case "Void": return "void";
                    default:
                        {
                            return string.IsNullOrWhiteSpace(type.FullName) ? type.Name : type.FullName;
                        }
                }

            var sb = new StringBuilder(type.Name.Substring(0,
            type.Name.IndexOf('`'))
            );
            sb.Append('<');
            var first = true;
            foreach (var t in type.GetGenericArguments())
            {
                if (!first)
                    sb.Append(',');
                sb.Append(TypeName(t));
                first = false;
            }
            sb.Append('>');
            return sb.ToString();
        }

    }
}

这几乎可以处理所有事情,包括扩展方法。从…开始 http://www.pcreview.co.uk/forums/getting-correct-method-signature-t3660896.html .

我在tandum中使用它和一个t4模板来为所有 Queryable 和 Enumerable LINQ扩展方法。

签出methodBase上的getParameters()方法。这将提供有关参数的信息,包括参数的名称。我不认为存在一个预先存在的方法来打印出名称,但是使用参数信息[]来构建它应该是很简单的。

这个怎么样?

public string GetSignature(MethodInfo mi)
{
  if(mi == null)
    return "";
  StringBuilder sb = new StringBuilder();

  if(mi.IsPrivate)
    sb.Append("private ");
  else if(mi.IsPublic)
    sb.Append("public ");
  if(mi.IsAbstract)
    sb.Append("abstract ");
  if(mi.IsStatic)
    sb.Append("static ");
  if(mi.IsVirtual)
    sb.Append("virtual ");

  sb.Append(mi.ReturnType.Name + " ");

  sb.Append(mi.Name + "(");

  String[] param = mi.GetParameters()
    .Select(p => String.Format(
              "{0} {1}",p.ParameterType.Name,p.Name))
                          .ToArray();


  sb.Append(String.Join(", ",param));

  sb.Append(")");

  return sb.ToString();
}