如何：从服务器上的工作簿中检索缓存的数据

项目
09/10/2008

更新：2007 年 11 月

适用对象
本主题中的信息仅适用于指定的 Visual Studio Tools for Office 项目和 Microsoft Office 版本。项目类型文档级项目 Microsoft Office 版本 Excel 2007 Excel 2003 有关更多信息，请参见按应用程序和项目类型提供的功能。

本主题中的信息仅适用于指定的 Visual Studio Tools for Office 项目和 Microsoft Office 版本。

项目类型

文档级项目

Microsoft Office 版本

Excel 2007
Excel 2003

不用运行 Excel，就可以检索属于文档级 Visual Studio Tools for Office 项目的 Microsoft Office Excel 工作簿的缓存中的数据。这样就可以从存储在服务器上的 Excel 工作簿中获取数据。

用于检索数据的代码必须位于与所处理的文档相关联的 Visual Studio Tools for Office 项目程序集之外，例如位于 ASP.NET 网页、控制台应用程序或 Windows 窗体应用程序中。

有关如何使用本主题中的代码示例的分步说明，请参见演练：从服务器上的工作簿中检索缓存的数据。

示例

下面的代码示例首先会创建类型化数据集 AdventureWorksLTDataSet 的一个实例。接下来，此代码将使用 ServerDocument 类的 CachedData 属性访问已缓存在 Excel 工作簿中的同一类型化数据集的另一个已填充实例，最后将该缓存数据集中的数据读入本地数据集。

Dim productDataSet As New AdventureWorksDataSet.AdventureWorksLTDataSet()
Dim workbookPath As String = System.Environment.GetFolderPath( _
    Environment.SpecialFolder.MyDocuments) & _
    "\AdventureWorksReport\bin\Debug\AdventureWorksReport.xlsx"
Dim serverDocument1 As ServerDocument = Nothing

Try
    serverDocument1 = New ServerDocument(workbookPath)
    Dim dataHostItem1 As CachedDataHostItem = _
        serverDocument1.CachedData.HostItems("AdventureWorksReport.Sheet1")
    Dim dataItem1 As CachedDataItem = dataHostItem1.CachedData("AdventureWorksLTDataSet")

    If dataItem1 IsNot Nothing Then
        Console.WriteLine("Before reading data from the cache dataset, the local dataset has " & _
            "{0} rows.", productDataSet.Product.Rows.Count.ToString())

        ' Read the cached data from the worksheet dataset into the local dataset.
        Dim schemaReader As New System.IO.StringReader(dataItem1.Schema)
        Dim xmlReader As New System.IO.StringReader(dataItem1.Xml)
        productDataSet.ReadXmlSchema(schemaReader)
        productDataSet.ReadXml(xmlReader)

        Console.WriteLine("After reading data from the cache dataset, the local dataset has " & _
            "{0} rows.", productDataSet.Product.Rows.Count.ToString())
    Else
        Console.WriteLine("The data object is not found in the data cache.")
    End If
Catch ex As System.IO.FileNotFoundException
    Console.WriteLine("The specified workbook does not exist.")
Catch ex As System.Xml.XmlException
    Console.WriteLine("The data object has invalid XML information.")
Finally
    If Not (serverDocument1 Is Nothing) Then
        serverDocument1.Close()
    End If
    Console.WriteLine(vbLf & vbLf & "Press Enter to close the application.")
    Console.ReadLine()
End Try

AdventureWorksDataSet.AdventureWorksLTDataSet productDataSet =
    new AdventureWorksDataSet.AdventureWorksLTDataSet();
string workbookPath = System.Environment.GetFolderPath(
    Environment.SpecialFolder.MyDocuments) +
    @"\AdventureWorksReport\bin\Debug\AdventureWorksReport.xlsx";
ServerDocument serverDocument1 = null;

try
{
    serverDocument1 = new ServerDocument(workbookPath);
    CachedDataHostItem dataHostItem1 =
        serverDocument1.CachedData.HostItems["AdventureWorksReport.Sheet1"];
    CachedDataItem dataItem1 = dataHostItem1.CachedData["adventureWorksLTDataSet"];

    if (dataItem1 != null)
    {
        Console.WriteLine("Before reading data from the cache dataset, the local dataset has " +
            "{0} rows.", productDataSet.Product.Rows.Count.ToString());

        // Read the cached data from the worksheet dataset into the local dataset.
        System.IO.StringReader schemaReader = new System.IO.StringReader(dataItem1.Schema);
        System.IO.StringReader xmlReader = new System.IO.StringReader(dataItem1.Xml);
        productDataSet.ReadXmlSchema(schemaReader);
        productDataSet.ReadXml(xmlReader);

        Console.WriteLine("After reading data from the cache dataset, the local dataset has " +
            "{0} rows.", productDataSet.Product.Rows.Count.ToString());
    }
    else
    {
        Console.WriteLine("The data object is not found in the data cache.");
    }
}
catch (System.IO.FileNotFoundException)
{
    Console.WriteLine("The specified workbook does not exist.");
}
catch (System.Xml.XmlException)
{
    Console.WriteLine("The data object has invalid XML information.");
}
finally
{
    if (serverDocument1 != null)
    {
        serverDocument1.Close();
    }

    Console.WriteLine("\n\nPress Enter to close the application.");
    Console.ReadLine();
}