CachedDataItem.DataType 屬性
取得或設定這個型別為快取資料物件的組件限定名稱。
命名空間： Microsoft.VisualStudio.Tools.Applications
組件： Microsoft.VisualStudio.Tools.Applications.ServerDocument (在 Microsoft.VisualStudio.Tools.Applications.ServerDocument.dll 中)
語法
'宣告
Public Property DataType As String
public string DataType { get; set; }
屬性值
型別：System.String
型別為快取資料物件的組件限定名稱。
備註
DataType 屬性會傳回型別為快取資料物件的組件限定名稱，這個名稱在建立自訂型別 (位於資料快取中) 的新執行個體時會很有用。 例如，您可以藉由將組件限定型別名稱傳遞給 GetType 方法的方式，取得自訂資料型別的 Type。 然後，便可以藉由將這個 Type 當做參數，傳遞給 Activator.CreateInstance 方法的方式，建立這個自訂型別的執行個體。
如需由 DataType 屬性傳回之組件限定型別字串格式的詳細資訊，請參閱 Type.AssemblyQualifiedName 屬性。
範例
下列程式碼範例會使用 SerializeDataInstance 方法修改 Excel 活頁簿工作表中快取的字串值。 程式碼會使用 DataType 屬性，驗證快取資料物件是否為字串，然後再嘗試修改它。
這個範例需要：
文件層級的自訂，適用於在 ExcelWorkbook1 命名空間中具有 Sheet1類別，以及在名為 CachedString 的 Sheet1 類別中具有快取字串的 Excel。
主控台應用程式專案或其他非 Office 專案。
下列組件的參考：
Microsoft.VisualStudio.Tools.Applications.ServerDocument.dll
Microsoft.VisualStudio.Tools.Applications.Runtime.dll
Microsoft.VisualStudio.Tools.Applications 和 Microsoft.VisualStudio.Tools.Applications.Runtime 命名空間 (在程式碼檔最頂端) 的Imports (Visual Basic) 或 using (C#) 陳述式。
Private Sub ModifyCachedString(ByVal documentPath As String)
Dim runtimeVersion As Integer = 0
Dim serverDocument1 As ServerDocument = Nothing
Try
runtimeVersion = ServerDocument.GetCustomizationVersion(documentPath)
If runtimeVersion <> 3 Then
MessageBox.Show("This document does not have a Visual Studio Tools for Office " & _
"customization, or it has a customization that was created with a version of " & _
"the runtime that is incompatible with this version of the ServerDocument class.")
Return
End If
If ServerDocument.IsCacheEnabled(documentPath) Then
serverDocument1 = New ServerDocument(documentPath)
Dim hostItem1 As CachedDataHostItem = _
serverDocument1.CachedData.HostItems("ExcelWorkbook1.Sheet1")
Dim dataItem1 As CachedDataItem = hostItem1.CachedData("CachedString")
If dataItem1 IsNot Nothing AndAlso _
Type.GetType(dataItem1.DataType).Equals(GetType(String)) Then
dataItem1.SerializeDataInstance("This is the new cached string value.")
serverDocument1.Save()
End If
Else
MessageBox.Show("The specified document does not have cached data.")
End If
Catch ex As System.IO.FileNotFoundException
System.Windows.Forms.MessageBox.Show("The specified document does not exist.")
Catch ex As UnknownCustomizationFileException
System.Windows.Forms.MessageBox.Show("The specified document has a file " & _
"extension that is not supported by Visual Studio Tools for Office.")
Finally
If Not (serverDocument1 Is Nothing) Then
serverDocument1.Close()
End If
End Try
End Sub
private void ModifyCachedString(string documentPath)
{
int runtimeVersion = 0;
ServerDocument serverDocument1 = null;
try
{
runtimeVersion = ServerDocument.GetCustomizationVersion(documentPath);
if (runtimeVersion != 3)
{
MessageBox.Show("This document does not have a Visual Studio Tools for " +
"Office customization, or it has a customization that was created with " +
"a version of the runtime that is incompatible with this version of the " +
"ServerDocument class.");
return;
}
if (ServerDocument.IsCacheEnabled(documentPath))
{
serverDocument1 = new ServerDocument(documentPath);
CachedDataHostItem hostItem1 =
serverDocument1.CachedData.HostItems["ExcelWorkbook1.Sheet1"];
CachedDataItem dataItem1 = hostItem1.CachedData["CachedString"];
if (dataItem1 != null &&
Type.GetType(dataItem1.DataType) == typeof(string))
{
dataItem1.SerializeDataInstance("This is the new cached string value.");
serverDocument1.Save();
}
}
else
{
MessageBox.Show("The specified document does not have cached data.");
}
}
catch (System.IO.FileNotFoundException)
{
System.Windows.Forms.MessageBox.Show("The specified document does not exist.");
}
catch (UnknownCustomizationFileException)
{
System.Windows.Forms.MessageBox.Show("The specified document has a file " +
"extension that is not supported by Visual Studio Tools for Office.");
}
finally
{
if (serverDocument1 != null)
serverDocument1.Close();
}
}
.NET Framework 安全性
- 完全信任立即呼叫者。這個成員無法供部分信任的程式碼使用。如需詳細資訊，請參閱從部分受信任程式碼使用程式庫。