Contains 方法
Returns a Boolean that indicates whether the items in the collection can be accessed by using indexing without throwing an exception.
命名空間： Microsoft.SqlServer.Dts.Runtime
組件： Microsoft.SqlServer.ManagedDTS (在 Microsoft.SqlServer.ManagedDTS.dll 中)
語法
'宣告
Public Function Contains ( _
index As Object _
) As Boolean
'用途
Dim instance As Variables
Dim index As Object
Dim returnValue As Boolean
returnValue = instance.Contains(index)
public bool Contains(
Object index
)
public:
bool Contains(
Object^ index
)
member Contains :
index:Object -> bool
public function Contains(
index : Object
) : boolean
參數
- index
型別：System. . :: . .Object
The name, ID, description, or index of the variable to locate in the collection.
傳回值
型別：System. . :: . .Boolean
A Boolean that indicates whether the collection can be accessed by using indexing. A value of true indicates that the collection can be accessed by using the syntax Variables[index].
If the Contains method returns false, this property will throw an exception. In C#, this property is the indexer for the Variables class.
範例
The following code example adds a variable to the package. The code example uses various methods to locate the variable and print out its name, value, and namespace.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
namespace Adding_Variables
{
class Program
{
static void Main(string[] args)
{
Application app = new Application();
Package pkg = app.LoadPackage(@"C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx", null);
Variables pkgVars = pkg.Variables;
Variable myVar = pkg.Variables.Add("myCustomVar", false, "User", "3");
// Verify whether the variable is in the collection now.
Boolean hasMyVar = pkg.Variables.Contains("myCustomVar");
Console.WriteLine("The variable was found? {0}", hasMyVar);
// Loop over the collection using the foreach keyword.
foreach (Variable pkgVar in pkgVars)
{
// Print variables only from the User namespace.
if (pkgVar.Namespace == "User")
{
Console.WriteLine("Variable: {0}, {1}", pkgVar.Name, pkgVar.Value.ToString());
}
}
Console.WriteLine("---------------------------");
// Loop over the collection using the Enumerator.
VariableEnumerator myEnum = pkg.Variables.GetEnumerator();
int i = 0;
while ((myEnum.MoveNext()) && (myEnum.Current != null))
// Again, show variables only from the User namespace.
if (myEnum.Current.Namespace == "User")
{
Console.WriteLine("[{0}] {1}, {2}", i++, myEnum.Current.Name, myEnum.Current.Namespace);
}
myEnum.Reset();
Console.WriteLine("---------------------------");
//Using the Item method syntax of [x], obtain the
// first entry in the collection.
myVar = pkgVars[0];
Console.WriteLine("The name and namespace of the first variable is: {0}, {1}", myVar.Name, myVar.Namespace);
String nameOfFirstItem = pkgVars[0].Name;
Console.WriteLine("The name of the first variable is: {0}", nameOfFirstItem);
//}
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Namespace Adding_Variables
Class Program
Shared Sub Main(ByVal args() As String)
Dim app As Application = New Application()
Dim pkg As Package = app.LoadPackage("C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx",Nothing)
Dim pkgVars As Variables = pkg.Variables
Dim myVar As Variable = pkg.Variables.Add("myCustomVar",False,"User","3")
' Verify whether the variable is in the collection now.
Dim hasMyVar As Boolean = pkg.Variables.Contains("myCustomVar")
Console.WriteLine("The variable was found? {0}", hasMyVar)
' Loop over the collection using the foreach keyword.
Dim pkgVar As Variable
For Each pkgVar In pkgVars
' Print variables only from the User namespace.
If pkgVar.Namespace = "User" Then
Console.WriteLine("Variable: {0}, {1}", pkgVar.Name, pkgVar.Value.ToString())
End If
Next
Console.WriteLine("---------------------------")
' Loop over the collection using the Enumerator.
Dim myEnum As VariableEnumerator = pkg.Variables.GetEnumerator()
Dim i As Integer = 0
While (myEnum.MoveNext()) &&(myEnum.Current <> Nothing)
Console.WriteLine("[{0}] {1}, {2}",i = Console.WriteLine("[{0}] {1}, {2}",i + 1
End While
myEnum.Reset()
Console.WriteLine("---------------------------")
'Using the Item method syntax of [x], obtain the
' first entry in the collection.
myVar = pkgVars(0)
Console.WriteLine("The name and namespace of the first variable is: {0}, {1}", myVar.Name, myVar.Namespace)
Dim nameOfFirstItem As String = pkgVars(0).Name
Console.WriteLine("The name of the first variable is: {0}", nameOfFirstItem)
'}
End Sub
End Class
End Namespace
Sample Output:
The variable was found? True
Variable: myCustomVar, 3
---------------------------
[0] myCustomVar, User
---------------------------
The name and namespace of the first variable is: CancelEvent, System
The name of the first variable is: CancelEvent