ObsoleteAttribute.Message Vlastnost

Definice

Obor názvů:

System

Sestavení:

System.Runtime.dll

Sestavení:

mscorlib.dll

Sestavení:

netstandard.dll

Získá zprávu alternativního řešení.

public:
 property System::String ^ Message { System::String ^ get(); };

public string Message { get; }

public string? Message { get; }

member this.Message : string

Public ReadOnly Property Message As String

Hodnota vlastnosti

String

Textový řetězec alternativního řešení.

Příklady

Následující příklad definuje třídu, která obsahuje dva členy označené jako zastaralé. První vlastnost s názvem OldProperty, vytvoří upozornění kompilátoru, pokud je volána. Druhá metoda s názvem CallOldMethodvytvoří chybu kompilátoru. Příklad používá reflexi k získání informací o ObsoleteAttribute atributech použitých na členy typu a zobrazí hodnoty jejich Message a IsError vlastností.

using System;
using System.Reflection;

public class Example
{
   // Mark OldProperty As Obsolete.
   [ObsoleteAttribute("This property is obsolete. Use NewProperty instead.", false)]
   public string OldProperty
   { get { return "The old property value."; } }

   public string NewProperty
   { get { return "The new property value."; } }

   // Mark OldMethod As Obsolete.
   [ObsoleteAttribute("This method is obsolete. Call NewMethod instead.", true)]
   public string OldMethod()
   {
      return "You have called OldMethod.";
   }

   public string NewMethod()
   {
      return "You have called NewMethod.";
   }

   public static void Main()
   {
      // Get all public members of this type.
      MemberInfo[] members = typeof(Example).GetMembers();
      // Count total obsolete members.
      int n = 0;

      // Try to get the ObsoleteAttribute for each public member.
      Console.WriteLine("Obsolete members in the Example class:\n");
      foreach (var member in members) {
         ObsoleteAttribute[] attribs = (ObsoleteAttribute[])
                                        member.GetCustomAttributes(typeof(ObsoleteAttribute),
                                                                   false);
         if (attribs.Length > 0) {
            ObsoleteAttribute attrib = attribs[0];
            Console.WriteLine("Member Name: {0}.{1}", member.DeclaringType.FullName, member.Name);
            Console.WriteLine("   Message: {0}", attrib.Message);
            Console.WriteLine("   Warning/Error: {0}", attrib.IsError ? "Error" : "Warning");
            n++;
         }
      }

      if (n == 0)
         Console.WriteLine("The Example type has no obsolete attributes.");
   }
}
// The example displays the following output:
//       Obsolete members in the Example class:
//
//       Member Name: Example.OldMethod
//          Message: This method is obsolete. Call NewMethod instead.
//          Warning/Error: Error
//       Member Name: Example.OldProperty
//          Message: This property is obsolete. Use NewProperty instead.
//          Warning/Error: Warning

open System

type Example() =
    // Mark OldProperty As Obsolete.
    [<ObsoleteAttribute("This property is obsolete. Use NewProperty instead.", false)>]
    member _.OldProperty =
        "The old property value."

    member _.NewProperty =
        "The new property value."

    // Mark OldMethod As Obsolete.
    [<ObsoleteAttribute("This method is obsolete. Call NewMethod instead.", true)>]
    member _.OldMethod() =
        "You have called OldMethod."

    member _.NewMethod() =
        "You have called NewMethod."

// Get all public members of this type.
let members = typeof<Example>.GetMembers()
// Count total obsolete members.
let mutable n = 0

// Try to get the ObsoleteAttribute for each public member.
printfn "Obsolete members in the Example class:\n"
for m in members do
    let attribs = m.GetCustomAttributes(typeof<ObsoleteAttribute>, false) |> box :?> ObsoleteAttribute[]
    if attribs.Length > 0 then
        let attrib = attribs[0]
        printfn $"Member Name: {m.DeclaringType.FullName}.{m.Name}"
        printfn $"   Message: {attrib.Message}"
        printfn $"""   Warning/Error: {if attrib.IsError then "Error" else "Warning"}"""
        n <- n + 1

if n = 0 then
    printfn "The Example type has no obsolete attributes."
// The example displays the following output:
//       Obsolete members in the Example class:
//
//       Member Name: Example+Example.OldMethod
//          Message: This method is obsolete. Call NewMethod instead.
//          Warning/Error: Error
//       Member Name: Example+Example.OldProperty
//          Message: This property is obsolete. Use NewProperty instead.
//          Warning/Error: Warning

Imports System.Reflection

Public Module Example
   ' Mark OldProperty As Obsolete.
   <ObsoleteAttribute("This property is obsolete. Use NewProperty instead.", False)> 
   Public ReadOnly Property OldProperty As String
      Get
         Return "The old property value."
      End Get
   End Property
   
   Public ReadOnly Property NewProperty As String
      Get
         Return "The new property value."
      End Get
   End Property
   
   ' Mark OldMethod As Obsolete.
   <ObsoleteAttribute("This method is obsolete. Call NewMethod instead.", True)> 
   Public Function OldMethod() As String
      Return "You have called OldMethod."
   End Function
      
   Public Function NewMethod() As String   
      Return "You have called NewMethod."
   End Function   
   
   Public Sub Main()
      ' Get all public members of this type.
      Dim members() As MemberInfo = GetType(Example).GetMembers()
      ' Count total obsolete members.
      Dim n As Integer = 0
      
      ' Try to get the ObsoleteAttribute for each public member.
      Console.WriteLine("Obsolete members in the Example class:")
      Console.WriteLine()
      For Each member In members
         Dim attribs() As ObsoleteAttribute = CType(member.GetCustomAttributes(GetType(ObsoleteAttribute), 
                                                                             False), ObsoleteAttribute())
         If attribs.Length > 0 Then
            Dim attrib As ObsoleteAttribute = attribs(0)
            Console.WriteLine("Member Name: {0}.{1}", member.DeclaringType.FullName, member.Name)
            Console.WriteLine("   Message: {0}", attrib.Message)             
            Console.WriteLine("   Warning/Error: {0}", if(attrib.IsError, "Error", "Warning"))      
            n += 1
         End If
      Next
      
      If n = 0 Then
         Console.WriteLine("The Example type has no obsolete attributes.")
      End If 
   End Sub  
End Module
' The example displays the following output:
'       Obsolete members in the Example class:
'       
'       Member Name: Example.OldMethod
'          Message: This method is obsolete. Call NewMethod instead.
'          Warning/Error: Error
'       Member Name: Example.OldProperty
'          Message: This property is obsolete. Use NewProperty instead.
'          Warning/Error: Warning