LogProvider.SetExpression(String, String) Метод

Определение

Пространство имен:: Microsoft.SqlServer.Dts.Runtime

Сборка:: Microsoft.SqlServer.ManagedDTS.dll

Важно!

Некоторые сведения относятся к предварительной версии продукта, в которую до выпуска могут быть внесены существенные изменения. Майкрософт не предоставляет никаких гарантий, явных или подразумеваемых, относительно приведенных здесь сведений.

Присваивает указанное выражение свойству. Укажите null, чтобы удалить существующее выражение из свойства.

public:
 virtual void SetExpression(System::String ^ propertyName, System::String ^ expression);

public void SetExpression(string propertyName, string expression);

abstract member SetExpression : string * string -> unit
override this.SetExpression : string * string -> unit

Public Sub SetExpression (propertyName As String, expression As String)

Параметры

propertyName: String

Название свойства, которому присваивается выражение.

expression: String

Выражение.

Реализации

SetExpression(String, String)

Примеры

Следующий пример задаёт свойство Описание поставщика логов как текст «This is the log for...» с текущим месяцем и днём, добавленными к концу строки.

using System;  
using System.Collections.Generic;  
using System.Text;  
using Microsoft.SqlServer.Dts.Runtime;  

namespace LogProvider_Expression_Tests  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            // The package is one of the SSIS Samples. The package was  
            // modified to log to the SSIS log provider for Text files  
            // and saved before loading into this code.  

            string mySample = @"C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\ExecuteProcess Sample\ExecuteProcess\UsingExecuteProcess.dtsx";  

            // Create the Application, and load the sample.  
            Application app = new Application();  
            Package pkg = app.LoadPackage(mySample, null);  

            // Get the LogProviders collection.  
            LogProviders logProvs = pkg.LogProviders;  

            // Get the "SSIS log provider for Text files"  
            // provider from the collection.  
            LogProvider textLogProv = logProvs["SSIS log provider for Text files"];  

            //Display the current description of this provider.  
            String currDescription = textLogProv.Description;  
            Console.WriteLine("Current description: {0}", currDescription);  

            // Set an expression. Only a few properties  
            // are available to have expressions. For Log Providers,   
            //current only the properties of ConfigString, Description,  
            // and Name take expressions.  
            DateTime dt = DateTime.Now;  
            String nowMonth = dt.ToString("m");  
            String newDesc = "\"This is the log for " + nowMonth + "\"";  
            textLogProv.SetExpression("Description", newDesc);  

            // Validate the package to set the expression  
            // onto the property.  
            Connections pkgConns = pkg.Connections;            
            DTSExecResult valResult = pkg.Validate(pkgConns, null, null, null);  
            if (valResult != DTSExecResult.Failure)  
            {  
                Console.WriteLine("Validation passed: {0}", valResult);  
            }  
            else  
                Console.WriteLine("Validation FAILED: {0}", valResult);  

            // Retrieve the log provider collections.  
            logProvs = pkg.LogProviders;  

            // Retreive the text log provider from the collection.  
            textLogProv = logProvs["SSIS log provider for Text files"];  

            // Check the expression, and verify that the name changed.  
            String logProvExpr = textLogProv.GetExpression("Description");  
            Console.WriteLine("The expression for Description is {0}", logProvExpr);  
            String newDescAfter = textLogProv.Description;  
            Console.WriteLine("The description is now: {0}", newDescAfter);  
        }  
    }  
}

Imports System  
Imports System.Collections.Generic  
Imports System.Text  
Imports Microsoft.SqlServer.Dts.Runtime  

Namespace LogProvider_Expression_Tests  
    Class Program  
        Shared Sub Main(ByVal args() As String)  
            ' The package is one of the SSIS Samples. The package was  
            ' modified to log to the SSIS log provider for Text files  
            ' and saved before loading into this code.  
            Dim mySample As String = "C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\ExecuteProcess Sample\ExecuteProcess\UsingExecuteProcess.dtsx"  

            ' Create the Application, and load the sample.  
            Dim app As New Application()  
            Dim pkg As Package = app.LoadPackage(mySample, Nothing)  

            ' Get the LogProviders collection.  
            Dim logProvs As LogProviders = pkg.LogProviders  

            ' Get the "SSIS log provider for Text files"  
            ' provider from the collection.  
            Dim textLogProv As LogProvider = logProvs("SSIS log provider for Text files")  

            'Display the current description of this provider.  
            Dim currDescription As String = textLogProv.Description  
            Console.WriteLine("Current description: {0}", currDescription)  

            ' Set an expression. Only a few properties  
            ' are available to have expressions. For Log Providers,   
            'current only the properties of ConfigString, Description,  
            ' and Name take expressions.  
            Dim dt As DateTime = DateTime.Now  
            Dim nowMonth As String = dt.ToString("m")  
            Dim newDesc As String = """This is the log for " + nowMonth + """"  
            textLogProv.SetExpression("Description", newDesc)  

            ' Validate the package to set the expression  
            ' onto the property.  
            Dim pkgConns As Connections = pkg.Connections  
            Dim valResult As DTSExecResult = pkg.Validate(pkgConns, Nothing, Nothing, Nothing)  
            If valResult <> DTSExecResult.Failure Then  
                Console.WriteLine("Validation passed: {0}", valResult)  
            Else  
                Console.WriteLine("Validation FAILED: {0}", valResult)  
            End If  
            ' Retrieve the log provider collections.  
            logProvs = pkg.LogProviders  

            ' Retreive the text log provider from the collection.  
            textLogProv = logProvs("SSIS log provider for Text files")  

            ' Check the expression, and verify that the name changed.  
            Dim logProvExpr As String = textLogProv.GetExpression("Description")  
            Console.WriteLine("The expression for Description is {0}", logProvExpr)  
            Dim newDescAfter As String = textLogProv.Description  
            Console.WriteLine("The description is now: {0}", newDescAfter)  
        End Sub  
    End Class  
End Namespace

Пример выходных данных

Текущее описание: Записывает записи журнала событий в CSV-файл

Валидация прошла: Успех

Выражение для описания — «Это журнал за 6 января»

Описание теперь таково: Это журнал за 6 января

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