एक प्रकार के उदाहरण को देखते हुए, सी # में सामान्य प्रकार का नाम कैसे प्राप्त करें?

Question

सहित

List<string> 
Nullable<Int32> 

कैसे मैं सी # के लिए एक सामान्य नाम मिलता है एक सामान्य प्रकार को देखते हुए?

var t = typeof(Nullable<DateTime>);  
var s = t.GetGenericTypeDefinition().Name + "<" + t.GetGenericArguments()[0].Name + ">"; 

यह पैदावार

"Nullable`1<DateTime>" 

, लेकिन मैं

"Nullable<DateTime>" 

की जरूरत है।

Answer 1

मैं देख रहा हूँ आप पहले से ही एक जवाब स्वीकार किए जाते हैं, लेकिन ईमानदारी से, कि इस सवाल का जवाब इस मज़बूती से करने के लिए पर्याप्त होना करने के लिए अगर आप सिर्फ गठबंधन क्या क्या आप पहले से ही लिखा है के साथ वहाँ में है नहीं जा रहा है। यह सही रास्ते पर है, लेकिन आपका कोड केवल सामान्य जेनेरिक पैरामीटर के साथ सामान्य प्रकार के लिए काम करेगा, और यह केवल तभी काम करेगा जब सामान्य प्रकार पैरामीटर सामान्य नहीं है!

public static class TypeExtensions 
{ 
    public static string ToGenericTypeString(this Type t) 
    { 
     if (!t.IsGenericType) 
      return t.Name; 
     string genericTypeName = t.GetGenericTypeDefinition().Name; 
     genericTypeName = genericTypeName.Substring(0, 
      genericTypeName.IndexOf('`')); 
     string genericArgs = string.Join(",", 
      t.GetGenericArguments() 
       .Select(ta => ToGenericTypeString(ta)).ToArray()); 
     return genericTypeName + "<" + genericArgs + ">"; 
    } 
} 

इस समारोह पुनरावर्ती और सुरक्षित है:

यह एक समारोह (एक विस्तार पद्धति के रूप में लिखा जाता है) है कि वास्तव में सभी मामलों में काम करना चाहिए है। आप इस इनपुट पर चला हैं:

Dictionary<String,List<Func<String,Boolean>>> 

Answer 2

माइनर अलावा @Aaronaught को

public string ToGenericTypeString(Type t) 
{ 
    if (!t.IsGenericType) 
     return t.FullName; 
    string genericTypeName = t.GetGenericTypeDefinition().FullName; 
    genericTypeName = genericTypeName.Substring(0, 
     genericTypeName.IndexOf('`')); 
    string genericArgs = string.Join(",", 
     t.GetGenericArguments() 
      .Select(ta => ToGenericTypeString(ta)).ToArray()); 
    return genericTypeName + "<" + genericArgs + ">"; 
} 

Answer 3

जबकि स्वीकार कर लिया समाधान सिर्फ के लिए अच्छा है:

Console.WriteLine(
    typeof(Dictionary<string, List<Func<string, bool>>>) 
    .ToGenericTypeString()); 

आप इस (सही) आउटपुट प्राप्त नाम या गैर नेस्टेड पूर्ण नाम के लिए (नाम को पूर्ण नाम से @Ose E के उत्तर में बदलकर), हालांकि नेस्टेड प्रकारों के लिए यह अभी भी काम नहीं करेगा, और सामान्य प्रकार के सरणी के लिए भी नहीं।

तो यहां एक समाधान है जो काम करेगा, (लेकिन ध्यान दें कि यह समाधान केवल वास्तविक तर्क निर्धारित करेगा, केवल तभी होगा जब सभी तर्क सेट किए गए हों, और दूसरे शब्दों में, भले ही घोषणा प्रकार ने प्रकार के सामानों की आपूर्ति की हो, सबसे सामान्य जेनेरिक प्रकार नहीं है, यह अभी भी आधार के लिए भी दिखाई नहीं देगा)।

public static string ToGenericTypeString(this Type t, params Type[] arg) 
    { 
     if (t.IsGenericParameter || t.FullName == null) return t.Name;//Generic argument stub 
     bool isGeneric = t.IsGenericType || t.FullName.IndexOf('`') >= 0;//an array of generic types is not considered a generic type although it still have the genetic notation 
     bool isArray = !t.IsGenericType && t.FullName.IndexOf('`') >= 0; 
     Type genericType = t; 
     while (genericType.IsNested && genericType.DeclaringType.GetGenericArguments().Count()==t.GetGenericArguments().Count())//Non generic class in a generic class is also considered in Type as being generic 
     { 
      genericType = genericType.DeclaringType; 
     } 
     if (!isGeneric) return t.FullName.Replace('+', '.'); 

     var arguments = arg.Any() ? arg : t.GetGenericArguments();//if arg has any then we are in the recursive part, note that we always must take arguments from t, since only t (the last one) will actually have the constructed type arguments and all others will just contain the generic parameters 
     string genericTypeName = genericType.FullName; 
     if (genericType.IsNested) 
     { 
      var argumentsToPass = arguments.Take(genericType.DeclaringType.GetGenericArguments().Count()).ToArray();//Only the innermost will return the actual object and only from the GetGenericArguments directly on the type, not on the on genericDfintion, and only when all parameters including of the innermost are set 
      arguments = arguments.Skip(argumentsToPass.Count()).ToArray(); 
      genericTypeName = genericType.DeclaringType.ToGenericTypeString(argumentsToPass) + "." + genericType.Name;//Recursive 
     } 
     if (isArray) 
     { 
      genericTypeName = t.GetElementType().ToGenericTypeString() + "[]";//this should work even for multidimensional arrays 
     } 
     if (genericTypeName.IndexOf('`') >= 0) 
     { 
      genericTypeName = genericTypeName.Substring(0, genericTypeName.IndexOf('`')); 
      string genericArgs = string.Join(",", arguments.Select(a => a.ToGenericTypeString()).ToArray()); 
       //Recursive 
      genericTypeName = genericTypeName + "<" + genericArgs + ">"; 
      if (isArray) genericTypeName += "[]"; 
     } 
     if (t != genericType) 
     { 
      genericTypeName += t.FullName.Replace(genericType.FullName, "").Replace('+','.'); 
     } 
     if (genericTypeName.IndexOf("[") >= 0 && genericTypeName.IndexOf("]") != genericTypeName.IndexOf("[") +1) genericTypeName = genericTypeName.Substring(0, genericTypeName.IndexOf("["));//For a non generic class nested in a generic class we will still have the type parameters at the end 
     return genericTypeName; 
    } 

Answer 4

यह मेरा समाधान है, यह भी नेस्टेड वर्गों और जेनरिक के लिए काम कर रहा है:

public static string GenericTypeString(this Type t) 
    { 
     if (!t.IsGenericType) 
     { 
      return t.GetFullNameWithoutNamespace() 
        .ReplacePlusWithDotInNestedTypeName(); 
     } 

     return t.GetGenericTypeDefinition() 
       .GetFullNameWithoutNamespace() 
       .ReplacePlusWithDotInNestedTypeName() 
       .ReplaceGenericParametersInGenericTypeName(t); 
    } 

    private static string GetFullNameWithoutNamespace(this Type type) 
    { 
     if (type.IsGenericParameter) 
     { 
      return type.Name; 
     } 

     const int dotLength = 1; 
     return type.FullName.Substring(type.Namespace.Length + dotLength); 
    } 

    private static string ReplacePlusWithDotInNestedTypeName(this string typeName) 
    { 
     return typeName.Replace('+', '.'); 
    } 

    private static string ReplaceGenericParametersInGenericTypeName(this string typeName, Type t) 
    { 
     var genericArguments = t.GetGenericArguments(); 

     const string regexForGenericArguments = @"`[1-9]\d*"; 

     var rgx = new Regex(regexForGenericArguments); 

     typeName = rgx.Replace(typeName, match => 
     { 
      var currentGenericArgumentNumbers = int.Parse(match.Value.Substring(1)); 
      var currentArguments = string.Join(",", genericArguments.Take(currentGenericArgumentNumbers).Select(GenericTypeString)); 
      genericArguments = genericArguments.Skip(currentGenericArgumentNumbers).ToArray(); 
      return string.Concat("<", currentArguments, ">"); 
     }); 

     return typeName; 
    } 

Answer 5

यह सीएस कोड जनरेटर की तरह बिल्कुल एक ही कोड परिणाम का परिणाम देगा। मैंने योएल हेल के कोड में सुधार किया है।

/// <summary> 
    ///  Gets the CS Type Code for a type 
    /// </summary> 
    /// <param name="type">The type.</param> 
    /// <returns></returns> 
    /// <exception cref="System.ArgumentNullException">type</exception> 
    public static string GetCSTypeName(this Type type) 
    { 
     if (type == typeof(string)) 
     { 
      return "string"; 
     } 
     else if (type == typeof(object)) { return "object"; } 
     else if (type == typeof(bool)) { return "bool"; } 
     else if (type == typeof(char)) { return "char"; } 
     else if (type == typeof(int)) { return "int"; } 
     else if (type == typeof(float)) { return "float"; } 
     else if (type == typeof(double)) { return "double"; } 
     else if (type == typeof(long)) { return "long"; } 
     else if (type == typeof(ulong)) { return "ulong"; } 
     else if (type == typeof(uint)) { return "uint"; } 
     else if (type == typeof(byte)) { return "byte"; } 
     else if (type == typeof(Int64)) { return "Int64"; } 
     else if (type == typeof(short)) { return "short"; } 
     else if (type == typeof(decimal)) { return "decimal"; } 
     else if (type.IsGenericType) 
     { 
      return $"{ToGenericTypeString(type)}"; 
     } 
     else if (type.IsArray) 
     { 
      List<string> arrayLength = new List<string>(); 
      for (int i = 0; i < type.GetArrayRank(); i++) 
      { 
       arrayLength.Add("[]"); 
      } 
      return GetCSTypeName(type.GetElementType()) + string.Join("", arrayLength).Replace("+", "."); 
     } 
     else 
     { 
      return type.FullName.Replace("+", "."); 
     } 
    } 

    private static string ToCSReservatedWord(this Type type, bool fullName) 
    { 
     if (type == typeof(string)) 
     { 
      return "string"; 
     } 
     else if (type == typeof(object)) { return "object"; } 
     else if (type == typeof(bool)) { return "bool"; } 
     else if (type == typeof(char)) { return "char"; } 
     else if (type == typeof(int)) { return "int"; } 
     else if (type == typeof(float)) { return "float"; } 
     else if (type == typeof(double)) { return "double"; } 
     else if (type == typeof(long)) { return "long"; } 
     else if (type == typeof(ulong)) { return "ulong"; } 
     else if (type == typeof(uint)) { return "uint"; } 
     else if (type == typeof(byte)) { return "byte"; } 
     else if (type == typeof(Int64)) { return "Int64"; } 
     else if (type == typeof(short)) { return "short"; } 
     else if (type == typeof(decimal)) { return "decimal"; } 
     else 
     { 
      if (fullName) 
      { 
       return type.FullName; 
      } 
      else 
      { 
       return type.Name; 
      } 

     } 
    } 

    public static string ToGenericTypeString(this Type t, params Type[] arg) 
    { 
     if (t.IsGenericParameter || t.FullName == null) return t.FullName;//Generic argument stub 
     bool isGeneric = t.IsGenericType || t.FullName.IndexOf('`') >= 0;//an array of generic types is not considered a generic type although it still have the genetic notation 
     bool isArray = !t.IsGenericType && t.FullName.IndexOf('`') >= 0; 
     Type genericType = t; 
     while (genericType.IsNested && genericType.DeclaringType.GetGenericArguments().Count() == t.GetGenericArguments().Count())//Non generic class in a generic class is also considered in Type as being generic 
     { 
      genericType = genericType.DeclaringType; 
     } 
     if (!isGeneric) return ToCSReservatedWord(t, true).Replace('+', '.'); 

     var arguments = arg.Any() ? arg : t.GetGenericArguments();//if arg has any then we are in the recursive part, note that we always must take arguments from t, since only t (the last one) will actually have the constructed type arguments and all others will just contain the generic parameters 
     string genericTypeName = genericType.ToCSReservatedWord(true); 
     if (genericType.IsNested) 
     { 
      var argumentsToPass = arguments.Take(genericType.DeclaringType.GetGenericArguments().Count()).ToArray();//Only the innermost will return the actual object and only from the GetGenericArguments directly on the type, not on the on genericDfintion, and only when all parameters including of the innermost are set 
      arguments = arguments.Skip(argumentsToPass.Count()).ToArray(); 
      genericTypeName = genericType.DeclaringType.ToGenericTypeString(argumentsToPass) + "." + ToCSReservatedWord(genericType, false);//Recursive 
     } 
     if (isArray) 
     { 
      genericTypeName = t.GetElementType().ToGenericTypeString() + "[]";//this should work even for multidimensional arrays 
     } 
     if (genericTypeName.IndexOf('`') >= 0) 
     { 
      genericTypeName = genericTypeName.Substring(0, genericTypeName.IndexOf('`')); 
      string genericArgs = string.Join(", ", arguments.Select(a => a.ToGenericTypeString()).ToArray()); 
      //Recursive 
      genericTypeName = genericTypeName + "<" + genericArgs + ">"; 
      if (isArray) genericTypeName += "[]"; 
     } 
     if (t != genericType) 
     { 
      genericTypeName += t.FullName.Replace(genericType.ToCSReservatedWord(true), "").Replace('+', '.'); 
     } 
     if (genericTypeName.IndexOf("[") >= 0 && genericTypeName.IndexOf("]") != genericTypeName.IndexOf("[") + 1) genericTypeName = genericTypeName.Substring(0, genericTypeName.IndexOf("["));//For a non generic class nested in a generic class we will still have the type parameters at the end 
     return genericTypeName; 
    } 

इस उम्मीद के रूप में निम्नलिखित इकाई परीक्षण पारित करेंगे।

[TestClass] 
public class GetCSName 
{ 

    private string GetCSCompilerName(Type type) 
    { 
     if (type == null) 
     { 
      throw new ArgumentNullException(nameof(type)); 
     } 
     var compiler = new CSharpCodeProvider(); 
     var typeRef = new CodeTypeReference(type); 
     return compiler.GetTypeOutput(typeRef); 
    } 

    [TestMethod] 
    public void TestMethod1() 
    { 
     List<Type> typesToTest = new List<Type>(); 
     typesToTest.Add(typeof(string)); 
     typesToTest.Add(typeof(string[])); 
     typesToTest.Add(typeof(object[])); 
     typesToTest.Add(typeof(bool[])); 
     typesToTest.Add(typeof(string)); 
     typesToTest.Add(typeof(object)); 
     typesToTest.Add(typeof(int)); 
     typesToTest.Add(typeof(double)); 
     typesToTest.Add(typeof(float)); 
     typesToTest.Add(typeof(bool)); 
     typesToTest.Add(typeof(char)); 
     typesToTest.Add(typeof(decimal)); 
     typesToTest.Add(typeof(decimal?[])); 
     typesToTest.Add(typeof(decimal?[][])); 
     typesToTest.Add(typeof(Int64)); 
     typesToTest.Add(typeof(Guid)); 
     typesToTest.Add(typeof(int?)); 
     typesToTest.Add(typeof(double?)); 
     typesToTest.Add(typeof(float?)); 
     typesToTest.Add(typeof(bool?)); 
     typesToTest.Add(typeof(char?)); 
     typesToTest.Add(typeof(decimal?)); 
     typesToTest.Add(typeof(Int64?)); 
     typesToTest.Add(typeof(Guid?)); 
     typesToTest.Add(typeof(List<string>)); 
     typesToTest.Add(typeof(Dictionary<string, Guid>)); 
     typesToTest.Add(typeof(Dictionary<string, Guid>[])); 
     typesToTest.Add(typeof(Dictionary<string, Guid?>)); 
     typesToTest.Add(typeof(Dictionary<string, Dictionary<string, Guid?>>)); 
     typesToTest.Add(typeof(Dictionary<string, Dictionary<string, Guid?>>[])); 
     typesToTest.Add(typeof(Dictionary<string, Dictionary<string, Guid?>>[][])); 
     typesToTest.Add(typeof(int[])); 
     typesToTest.Add(typeof(int[][])); 
     typesToTest.Add(typeof(int[][][])); 
     typesToTest.Add(typeof(int[][][][])); 
     typesToTest.Add(typeof(int[][][][][])); 
     typesToTest.Add(typeof(TestClass)); 
     typesToTest.Add(typeof(List<TestClass>)); 
     typesToTest.Add(typeof(Dictionary<TestClass, TestClass>)); 
     typesToTest.Add(typeof(Dictionary<string, TestClass>)); 
     typesToTest.Add(typeof(List<Dictionary<string, TestClass>>)); 
     typesToTest.Add(typeof(List<Dictionary<string, GenericTestClass<string>>>)); 
     typesToTest.Add(typeof(GenericTestClass<string>.SecondSubType<decimal>)); 
     typesToTest.Add(typeof(GenericTestClass<string>.SecondSubType)); 
     typesToTest.Add(typeof(GenericTestClass<string, int>.SecondSubType)); 
     typesToTest.Add(typeof(GenericTestClass<string, Dictionary<string,int>>.SecondSubType<string>)); 
     typesToTest.Add(typeof(GenericTestClass<string, Dictionary<string, int>>.SecondSubType<GenericTestClass<string, Dictionary<string, int>>>)); 


     foreach (var t in typesToTest) 
     { 
      if (GetCSCompilerName(t) != t.GetCSTypeName()) 
      { 
       Console.WriteLine($"FullName:\r\n{t.FullName}"); 
       Console.WriteLine("C " + GetCSCompilerName(t)); 
       Console.WriteLine("R " + t.GetCSTypeName()); 
       Console.WriteLine("Equal: " + (GetCSCompilerName(t) == t.GetCSTypeName())); 
       Console.WriteLine(); 

       Assert.Fail($"From CSharpCodeProvider '{GetCSCompilerName(t)}' is not equal to {t.GetCSTypeName()}"); 
      } 
      else 
      { 
       Console.WriteLine($"Passed: {t.GetCSTypeName()}"); 
       //ignore because of equal. 
      } 


     } 

    } 

    public class TestClass 
    { 

    } 

    public class GenericTestClass<T> 
    { 
     public class SecondSubType 
     { 

     } 

     public class SecondSubType<T2> 
     { 

     } 
    } 

    public class GenericTestClass<T1,T2> 
    { 
     public class SecondSubType 
     { 

     } 

     public class SecondSubType<T2> 
     { 

     } 
    } 
} 

परिणाम होगा:

Passed: string 
Passed: string[] 
Passed: object[] 
Passed: bool[] 
Passed: string 
Passed: object 
Passed: int 
Passed: double 
Passed: float 
Passed: bool 
Passed: char 
Passed: decimal 
Passed: System.Nullable<decimal>[] 
Passed: System.Nullable<decimal>[][] 
Passed: long 
Passed: System.Guid 
Passed: System.Nullable<int> 
Passed: System.Nullable<double> 
Passed: System.Nullable<float> 
Passed: System.Nullable<bool> 
Passed: System.Nullable<char> 
Passed: System.Nullable<decimal> 
Passed: System.Nullable<long> 
Passed: System.Nullable<System.Guid> 
Passed: System.Collections.Generic.List<string> 
Passed: System.Collections.Generic.Dictionary<string, System.Guid> 
Passed: System.Collections.Generic.Dictionary<string, System.Guid>[] 
Passed: System.Collections.Generic.Dictionary<string, System.Nullable<System.Guid>> 
Passed: System.Collections.Generic.Dictionary<string, System.Collections.Generic.Dictionary<string, System.Nullable<System.Guid>>> 
Passed: System.Collections.Generic.Dictionary<string, System.Collections.Generic.Dictionary<string, System.Nullable<System.Guid>>>[] 
Passed: System.Collections.Generic.Dictionary<string, System.Collections.Generic.Dictionary<string, System.Nullable<System.Guid>>>[][] 
Passed: int[] 
Passed: int[][] 
Passed: int[][][] 
Passed: int[][][][] 
Passed: int[][][][][] 
Passed: Eneon.Common.Utils.Extensions.Tests.GetCSName.TestClass 
Passed: System.Collections.Generic.List<Eneon.Common.Utils.Extensions.Tests.GetCSName.TestClass> 
Passed: System.Collections.Generic.Dictionary<Eneon.Common.Utils.Extensions.Tests.GetCSName.TestClass, Eneon.Common.Utils.Extensions.Tests.GetCSName.TestClass> 
Passed: System.Collections.Generic.Dictionary<string, Eneon.Common.Utils.Extensions.Tests.GetCSName.TestClass> 
Passed: System.Collections.Generic.List<System.Collections.Generic.Dictionary<string, Eneon.Common.Utils.Extensions.Tests.GetCSName.TestClass>> 
Passed: System.Collections.Generic.List<System.Collections.Generic.Dictionary<string, Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string>>> 
Passed: Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string>.SecondSubType<decimal> 
Passed: Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string>.SecondSubType 
Passed: Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string, int>.SecondSubType 
Passed: Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string, System.Collections.Generic.Dictionary<string, int>>.SecondSubType<string> 
Passed: Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string, System.Collections.Generic.Dictionary<string, int>>.SecondSubType<Eneon.Common.Utils.Extensions.Tests.GetCSName.GenericTestClass<string, System.Collections.Generic.Dictionary<string, int>>>