Exception.ToString Exception.ToString Exception.ToString Exception.ToString Method

定義

現在の例外の文字列形式を作成して返します。Creates and returns a string representation of the current exception.

public:
 override System::String ^ ToString();
public override string ToString ();
override this.ToString : unit -> string
Public Overrides Function ToString () As String

戻り値

現在の例外の文字列形式。A string representation of the current exception.

実装

次の例は、例外が発生し、呼び出し元の結果が表示されますToStringその例外でします。The following example causes an exception and displays the result of calling ToString on that exception. なお、Exception.ToString例外クラスのインスタンスが引数の一覧に表示されたら、メソッドが暗黙的に呼び出されます、Console.WriteLineメソッド。Note that the Exception.ToString method is called implicitly when the Exception class instance appears in the argument list of the Console.WriteLine method.

using namespace System;

public ref class TestClass{};

int main()
{
   TestClass^ test = gcnew TestClass;
   array<Object^>^ objectsToCompare = { test, test->ToString(), 123,
                                        (123).ToString(), "some text",
                                        "Some Text" };
   String^ s = "some text";
   for each (Object^ objectToCompare in objectsToCompare) {
      try {
         Int32 i = s->CompareTo(objectToCompare);
         Console::WriteLine("Comparing '{0}' with '{1}': {2}",
                            s, objectToCompare, i);
      }
      catch (ArgumentException^ e) {
            Console::WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare->GetType()->Name);
            Console::WriteLine("Exception information: {0}", e);
      }
      Console::WriteLine();
   }
}
// The example displays the following output:
//     Bad argument: TestClass (type TestClass)
//     Exception information: System.ArgumentException: Object must be of type String.
//        at System.String.CompareTo(Object value)
//        at Example.Main()
//     
//     Comparing 'some text' with 'TestClass': -1
//     
//     Bad argument: 123 (type Int32)
//     Exception information: System.ArgumentException: Object must be of type String.
//        at System.String.CompareTo(Object value)
//        at Example.Main()
//     
//     Comparing 'some text' with '123': 1
//     
//     Comparing 'some text' with 'some text': 0
//     
//     Comparing 'some text' with 'Some Text': -1
using System;

public class TestClass
{}

public class Example 
{
   public static void Main()
   {
      var test = new TestClass();
      Object[] objectsToCompare = { test, test.ToString(), 123,
                                    123.ToString(), "some text",
                                    "Some Text" };
      string s = "some text";
      foreach (var objectToCompare in objectsToCompare) {
         try {
            int i = s.CompareTo(objectToCompare);
            Console.WriteLine("Comparing '{0}' with '{1}': {2}",
                              s, objectToCompare, i);
         }
         catch (ArgumentException e) {
            Console.WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare.GetType().Name);
            Console.WriteLine("Exception information: {0}", e);
         }
         Console.WriteLine();
      }
   }
}
// The example displays the following output:
//     Bad argument: TestClass (type TestClass)
//     Exception information: System.ArgumentException: Object must be of type String.
//        at System.String.CompareTo(Object value)
//        at Example.Main()
//     
//     Comparing 'some text' with 'TestClass': -1
//     
//     Bad argument: 123 (type Int32)
//     Exception information: System.ArgumentException: Object must be of type String.
//        at System.String.CompareTo(Object value)
//        at Example.Main()
//     
//     Comparing 'some text' with '123': 1
//     
//     Comparing 'some text' with 'some text': 0
//     
//     Comparing 'some text' with 'Some Text': -1
Public Class TestClass
End Class 

Public Class Example
   Public Shared Sub Main()
      Dim test As New TestClass()
      Dim objectsToCompare() As Object = { test, test.ToString(), 123,
                                           123.ToString(), "some text",
                                           "Some Text" }
      Dim s As String = "some text"
      For Each objectToCompare In objectsToCompare
         Try
            Dim i As Integer = s.CompareTo(objectToCompare)
            Console.WriteLine("Comparing '{0}' with '{1}': {2}",
                              s, objectToCompare, i)
         Catch e As ArgumentException
            Console.WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare.GetType().Name)
            Console.WriteLine("Exception information: {0}", e)
         End Try
         Console.WriteLine()
      Next
   End Sub 
End Class 
' The example displays the following output:
'     Bad argument: TestClass (type TestClass)
'     Exception information: System.ArgumentException: Object must be of type String.
'        at System.String.CompareTo(Object value)
'        at Example.Main()
'     
'     Comparing 'some text' with 'TestClass': -1
'     
'     Bad argument: 123 (type Int32)
'     Exception information: System.ArgumentException: Object must be of type String.
'        at System.String.CompareTo(Object value)
'        at Example.Main()
'     
'     Comparing 'some text' with '123': 1
'     
'     Comparing 'some text' with 'some text': 0
'     
'     Comparing 'some text' with 'Some Text': -1

注釈

ToString 人間が理解できるものでは現在の例外の表現を返します。ToString returns a representation of the current exception that is intended to be understood by humans. 例外には、カルチャに依存するデータが含まれる、文字列形式にによって返されますToStringする現在のシステム カルチャが考慮が必要です。Where the exception contains culture-sensitive data, the string representation returned by ToString is required to take into account the current system culture. 返される文字列の形式については、正確な要件はありませんは、ユーザー側で認識されるオブジェクトの値を反映するように試行する必要があります。Although there are no exact requirements for the format of the returned string, it should attempt to reflect the value of the object as perceived by the user.

既定の実装ToStringを現在の例外、メッセージ、呼び出しの結果をスローしたクラスの名前を取得します。ToString内部例外、および呼び出しの結果でEnvironment.StackTraceします。The default implementation of ToString obtains the name of the class that threw the current exception, the message, the result of calling ToString on the inner exception, and the result of calling Environment.StackTrace. これらのメンバーのいずれかが場合null、その値が返される文字列に含まれません。If any of these members is null, its value is not included in the returned string.

エラー メッセージがない場合、または空の文字列である場合 ("")、エラー メッセージが返されません。If there is no error message or if it is an empty string (""), then no error message is returned. それ以外の場合にのみ、内部例外とスタック トレースの名前が返されるnullします。The name of the inner exception and the stack trace are returned only if they are not null.

このメソッドは、Object.ToString をオーバーライドします。This method overrides Object.ToString.

適用対象