ForLoop.AssignExpression Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan atau mengatur ekspresi ke kenaikan atau penurunan penghitung perulangan.
public:
property System::String ^ AssignExpression { System::String ^ get(); void set(System::String ^ value); };
[Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "AssignExpressionDesc")]
public string AssignExpression { get; set; }
[<Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "AssignExpressionDesc")>]
member this.AssignExpression : string with get, set
Public Property AssignExpression As String
Nilai Properti
String yang berisi ekspresi yang menaikkan atau mengurangi penghitung perulangan.
- Atribut
Contoh
Contoh kode berikut membuat ForLoop dan mengatur tiga properti ekspresi. juga ForLoop berisi dua tugas dengan batasan prioritas.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
using Microsoft.SqlServer.Dts.Tasks.SendMailTask;
using Microsoft.SqlServer.Dts.Tasks.BulkInsertTask;
namespace ForLoopAPI
{
class Program
{
static void Main(string[] args)
{
String varName = "MyVariable";
int INIT_COUNT = 2;
int MAX_COUNT = 5;
Package pkg = new Package();
Variable var = pkg.Variables.Add(varName, false, "", 0);
Variable var2 = pkg.Variables.Add("Counter", false, "", 0);
ForLoop forLoop = (ForLoop)pkg.Executables.Add("STOCK:ForLoop");
forLoop.InitExpression = "@"+varName+" = "+INIT_COUNT;
forLoop.EvalExpression = "@"+varName+" < "+MAX_COUNT;
forLoop.AssignExpression = "@" + varName + " = @" + varName + " + " + INIT_COUNT;
// Show a different syntax for setting these values.
//forLoop.InitExpression = "@Counter = 1";
//forLoop.AssignExpression = "@Counter = @Counter + 1";
//forLoop.EvalExpression = "@Counter <= 10";
// The ForLoop contains a Properties collection.
// Show how to set some properties using that collection.
forLoop.Properties["Name"].SetValue(forLoop, "ForLoop Container");
forLoop.Properties["Description"].SetValue(forLoop, "ForLoop Container");
// Review the PackagePath of the ForLoop container.
Console.WriteLine("PackagePath: {0}", forLoop.GetPackagePath());
// Because the ForLoop is a container, it can contain tasks
// that run at certain conditions.
TaskHost thLoopMail = (TaskHost)forLoop.Executables.Add("STOCK:SendMailTask");
TaskHost thLoopInsert = (TaskHost)forLoop.Executables.Add("STOCK:BulkInsertTask");
Executables loopExecs = forLoop.Executables;
Console.WriteLine("Number of Executables in ForLoop: {0}", loopExecs.Count);
// Like other containers, precedence constraints can be set on the
// contained tasks.
PrecedenceConstraint pc = forLoop.PrecedenceConstraints.Add((Executable)thLoopMail, thLoopInsert);
PrecedenceConstraints pcs = forLoop.PrecedenceConstraints;
Console.WriteLine("Number of precedence constraints: {0}", pcs.Count);
// Run the package. Because required properties on the tasks are not
// set, current sample code will fail.
DTSExecResult result = pkg.Execute();
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Imports Microsoft.SqlServer.Dts.Tasks.SendMailTask
Imports Microsoft.SqlServer.Dts.Tasks.BulkInsertTask
Namespace ForLoopAPI
Class Program
'Entry point which delegates to C-style main Private Function
Public Overloads Shared Sub Main()
Main(System.Environment.GetCommandLineArgs())
End Sub
Overloads Shared Sub Main(args() As String)
Dim varName As String = "MyVariable"
Dim INIT_COUNT As Integer = 2
Dim MAX_COUNT As Integer = 5
Dim pkg As New Package()
Dim var As Variable = pkg.Variables.Add(varName, False, "", 0)
Dim var2 As Variable = pkg.Variables.Add("Counter", False, "", 0)
Dim forLoop As ForLoop = CType(pkg.Executables.Add("STOCK:ForLoop"), ForLoop)
forLoop.InitExpression = "@" + varName + " = " + INIT_COUNT
forLoop.EvalExpression = "@" + varName + " < " + MAX_COUNT
forLoop.AssignExpression = "@" + varName + " = @" + varName + " + " + INIT_COUNT
' Show a different syntax for setting these values.
forLoop.InitExpression = "@Counter = 1"
forLoop.AssignExpression = "@Counter = @Counter + 1"
forLoop.EvalExpression = "@Counter <= 10"
' The ForLoop contains a Properties collection.
' Show how to set some properties using that collection.
forLoop.Properties("Name").SetValue(forLoop, "ForLoop Container")
forLoop.Properties("Description").SetValue(forLoop, "ForLoop Container")
' Review the PackagePath of the ForLoop container.
Console.WriteLine("PackagePath: {0}", forLoop.GetPackagePath())
' Because the ForLoop is a container, it can contain tasks
' that run at certain conditions.
Dim thLoopMail As TaskHost = CType(forLoop.Executables.Add("STOCK:SendMailTask"), TaskHost)
Dim thLoopInsert As TaskHost = CType(forLoop.Executables.Add("STOCK:BulkInsertTask"), TaskHost)
Dim loopExecs As Executables = forLoop.Executables
Console.WriteLine("Number of Executables in ForLoop: {0}", loopExecs.Count)
' Like other containers, precedence constraints can be set on the
' contained tasks.
Dim pc As PrecedenceConstraint = forLoop.PrecedenceConstraints.Add(CType(thLoopMail, Executable), thLoopInsert)
Dim pcs As PrecedenceConstraints = forLoop.PrecedenceConstraints
Console.WriteLine("Number of precedence constraints: {0}", pcs.Count)
' Run the package. Because required properties on the tasks are not
' set, current sample code will fail.
Dim result As DTSExecResult = pkg.Execute()
End Sub 'Main
End Class 'Program
End Namespace 'ForLoopAPI
Contoh Output:
PackagePath: \Package\{8A18B94E-1176-429E-BB3d-6F3F1E0C9070}
Jumlah Executable di ForLoop: 2
Jumlah batasan prioritas: 1