這是我在寫程式碼產生器常遇到的小困擾。例如: 當透過Reflection偵測型別轉成屬性型別宣告時，typeof(T).ToString()會產生如"System.String"的完整型別名稱，故不時會出現如下的產出結果:
public class Player
{
public System.String Name { get; set; }
public System.Int32 Score { get; set; }
....略....
有沒有覺得程式碼裡充滿System.String、System.Int32 十分"矯情"，一點都不像正常人會寫的程式(雖然它執行起來100%正確)，充滿了賤人機械味。一時手癢想改善這點小瑕疵，便參考C#文件關於Predefined Types(預先定義的型別)的項目建成轉換字典，如此便可將產出程式碼的System.Int32換成親切的int，看起來賞心悅目多了!
//REF: http://msdn.microsoft.com/en-us/library/aa664635(v=vs.71).aspxstaticstring[] typeMap = newstring[] {
"object,System.Object","string,System.String","sbyte,System.SByte","short,System.Int16","int,System.Int32","long,System.Int64","byte,System.Byte","ushort,System.UInt16","uint,System.UInt32","ulong,System.UInt64","float,System.Single","double,System.Double","bool,System.Boolean","char,System.Char","decimal,System.Decimal"};
static Dictionary<string, string> PT2Name =
typeMap.ToDictionary(o => o.Split(',')[0], o => o.Split(',')[1]);
static Dictionary<string, string> Name2PT =
typeMap.ToDictionary(o => o.Split(',')[1], o => o.Split(',')[0]);
staticvoid Test()
{string s = typeof(string).FullName;
Console.WriteLine("{0}->{1}", s, Name2PT[s]); s = "uint"; Console.WriteLine("{0}->{1}", s, PT2Name[s]);}
【同場加映】
透過Reflection取得泛型及巢狀類別相關型別時，會出現如"`"、"+"等符號。例如: typeof(Dictionary<string, Dictionary<DateTime, Boo.Foo>>).ToString()，會得到奇怪的字串結果: (Boo.Foo為定義在Boo裡的巢狀型別)
System.Collections.Generic.Dictionary`2[System.String,System.Collections.Generic.Dictionary`2[System.DateTime,Boo+Foo]]
如果直接在程式碼使用它當作類別宣告，包你錯到鬼哭神號。針對這個問題，我在Stackoverflow上找到一段高手寫的簡短函數，自己補上巢狀型別的"+"轉換，再接上前述的Predefined Type名稱置換、省略System.*命名空間(註: 需配合對應的using namespace宣告)等簡化，最後終於導回正軌，得到:
Dictionary<string,Dictionary<DateTime,Boo.Foo>>
範例程式碼如下，供有興趣的朋友參考:
using System;using System.Collections.Generic;using System.Linq;using System.Text.RegularExpressions;publicclass Boo
{publicclass Foo { }
}
class Program{staticvoid Main(string[] args)
{Type t = typeof(Dictionary<string, Dictionary<DateTime, Boo.Foo>>);
Console.WriteLine(t.ToString());
Console.WriteLine(GetFriendlyTypeName(t));
Console.Read();
}
//REF: http://msdn.microsoft.com/en-us/library/aa664635(v=vs.71).aspxstaticstring[] typeMap = newstring[] {
"object,System.Object","string,System.String","sbyte,System.SByte","short,System.Int16","int,System.Int32","long,System.Int64","byte,System.Byte","ushort,System.UInt16","uint,System.UInt32","ulong,System.UInt64","float,System.Single","double,System.Double","bool,System.Boolean","char,System.Char","decimal,System.Decimal"};
static Dictionary<string, string> PT2Name =
typeMap.ToDictionary(o => o.Split(',')[0], o => o.Split(',')[1]);
static Dictionary<string, string> Name2PT =
typeMap.ToDictionary(o => o.Split(',')[1], o => o.Split(',')[0]);
//REF: http://stackoverflow.com/questions/401681//Add nested type name, predefined types, System.* namespace trimming supportpublicstaticstring GetFriendlyTypeName(Type type)
{Func<string, string> fixTypeName =
(s) =>
{s = s.Replace("+", "."); //Fix nested type name
//Replace predefined typesforeach (string n in Name2PT.Keys)
s = s.Replace(n, Name2PT[n]);
//Trim System.* namespace s = Regex.Replace(s, @"System\.(\w+\.)*(?<n>\w+)", m => m.Groups["n"].Value);return s;};
if (type.IsGenericParameter) {return fixTypeName(type.Name);}
if (!type.IsGenericType) {return fixTypeName(type.FullName);}
var builder = new System.Text.StringBuilder();var name = type.Name;
var index = name.IndexOf("`");builder.AppendFormat(
fixTypeName(type.Namespace + "." + name.Substring(0, index))); builder.Append('<'); var first = true;foreach (var arg in type.GetGenericArguments())
{if (!first) { builder.Append(',');}
builder.Append(GetFriendlyTypeName(arg));
first = false;}
builder.Append('>');return builder.ToString();}
}
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