DataObject.GetData 方法

public:
 virtual System::Object ^ GetData(System::String ^ format, bool autoConvert);

public virtual object GetData(string format, bool autoConvert);

abstract member GetData : string * bool -> obj
override this.GetData : string * bool -> obj

Public Overridable Function GetData (format As String, autoConvert As Boolean) As Object

參數

傳回

與指定格式相關的資料，或 null。

實作

範例

以下程式碼範例利用參數指定是否轉換資料格式，取得儲存在 中DataObjectautoConvert的資料。

首先，會用文字資料建立一個新 DataObject 檔案。 接著範例嘗試擷取資料，將格式指定為字串且不需格式轉換，也就是 autoConvert 參數為 false。 此操作失敗是因為 中 DataObject沒有字串資料。

接著，範例嘗試再次取得資料，參數 autoConvert 設為 true。 此操作成功後，結果會以 。MessageBox

這套規範要求已經建立。textBox1

private:
   void GetMyData3()
   {
      // Creates a new data object using a string and the text format.
      String^ myString = "My new text string";
      DataObject^ myDataObject = gcnew DataObject( DataFormats::Text,myString );
      
      // Prints the string in a text box with autoconvert = false.
      if ( myDataObject->GetData( "System.String", false ) != 0 )
      {
         // Prints the string in a text box.
         textBox1->Text = String::Concat(
            myDataObject->GetData( "System.String", false )->ToString(), "\n" );
      }
      else
      {
         textBox1->Text = "Could not find data of the specified format\n";
      }
      
      // Prints the string in a text box with autoconvert = true.
      textBox1->Text = String::Concat(
            textBox1->Text, myDataObject->GetData( "System.String", true )->ToString() );
   }

private void GetMyData3() {
    // Creates a new data object using a string and the text format.
    string myString = "My new text string";
    DataObject myDataObject = new DataObject(DataFormats.Text, myString);
 
    // Prints the string in a text box with autoconvert = false.
    if(myDataObject.GetData("System.String", false) != null) {
       // Prints the string in a text box.
       textBox1.Text = myDataObject.GetData("System.String", false).ToString() + '\n';
    } else
        {
            textBox1.Text = "Could not find data of the specified format" + '\n';
        }

        // Prints the string in a text box with autoconvert = true.
        textBox1.Text += myDataObject.GetData("System.String", true).ToString();
 }

Private Sub GetMyData3()
    ' Creates a new data object using a string and the text format.
    Dim myString As String = "My new text string"
    Dim myDataObject As New DataObject(DataFormats.Text, myString)
    
    ' Prints the string in a text box with autoconvert = false.
    If (myDataObject.GetData("System.String", False) IsNot Nothing) Then
        ' Prints the string in a text box.
        textBox1.Text = myDataObject.GetData("System.String", False).ToString() & ControlChars.Cr
    Else
        textBox1.Text = "Could not find data of the specified format" & ControlChars.Cr
    End If 
    ' Prints the string in a text box with autoconvert = true.
    textBox1.Text += myDataObject.GetData("System.String", True).ToString()
End Sub

備註

如果 autoConvert 參數是， true 且此方法找不到指定格式的資料，則嘗試將資料轉換成該格式。 若資料無法轉換為指定格式，或資料儲存時自動轉換設定為 false，則此方法回傳 null。

若 autoConvert 參數為 false，則此方法回傳指定格式的資料，若 null 找不到該格式的資料。

要判斷資料是否與某種格式相關聯或可轉換成格式，請先GetData呼叫 GetDataPresent 。 請呼叫 GetFormats 一份存於此 DataObject資料的有效格式清單。

另請參閱

• SetData(String, Boolean, Object)
• GetDataPresent(Type)
• DataFormats
• GetFormats(Boolean)

public:
 virtual System::Object ^ GetData(System::String ^ format);

public virtual object GetData(string format);

abstract member GetData : string -> obj
override this.GetData : string -> obj

Public Overridable Function GetData (format As String) As Object

參數

傳回

與指定格式相關的資料，或 null。

實作

範例

以下程式碼範例取回儲存在 DataObject. 首先，會用文字資料建立一個新 DataObject 檔案。 接著，資料會被檢索，並以字串形式指定，並顯示在文字框中。

這套規範要求已經建立。textBox1

private:
   void AddMyData3()
   {
      // Creates a component to store in the data object.
      Component^ myComponent = gcnew Component;
      
      // Creates a new data object.
      DataObject^ myDataObject = gcnew DataObject;
      
      // Adds the component to the DataObject.
      myDataObject->SetData( myComponent );
      
      // Prints whether data of the specified type is in the DataObject.
      Type^ myType = myComponent->GetType();
      if ( myDataObject->GetDataPresent( myType ) )
      {
         textBox1->Text = String::Concat( "Data of type ", myType,
            " is present in the DataObject" );
      }
      else
      {
         textBox1->Text = String::Concat( "Data of type ", myType,
            " is not present in the DataObject" );
      }
   }

private void AddMyData3() {
    // Creates a component to store in the data object.
    Component myComponent = new Component();
 
    // Creates a new data object.
    DataObject myDataObject = new DataObject();
 
    // Adds the component to the DataObject.
    myDataObject.SetData(myComponent);
 
    // Prints whether data of the specified type is in the DataObject.
    Type myType = myComponent.GetType();
    if(myDataObject.GetDataPresent(myType))
       textBox1.Text = "Data of type " + myType.ToString() + 
       " is present in the DataObject";
    else
       textBox1.Text = "Data of type " + myType.ToString() +
       " is not present in the DataObject";
 }

Private Sub AddMyData3()
    ' Creates a component to store in the data object.
    Dim myComponent As New Component()
    
    ' Creates a new data object.
    Dim myDataObject As New DataObject()
    
    ' Adds the component to the DataObject.
    myDataObject.SetData(myComponent)
    
    ' Prints whether data of the specified type is in the DataObject.
    Dim myType As Type = myComponent.GetType()
    If myDataObject.GetDataPresent(myType) Then
        textBox1.Text = "Data of type " & myType.ToString() & _
            " is present in the DataObject"
    Else
        textBox1.Text = "Data of type " & myType.ToString() & _
            " is not present in the DataObject"
    End If
End Sub

備註

若此方法找不到指定格式的資料，則嘗試將資料轉換成該格式。 若資料無法轉換為指定格式，或資料儲存時自動轉換為 false，則此方法會回傳 null。

要判斷資料是否與某種格式相關聯或可轉換成格式，請先GetData呼叫 GetDataPresent 。 請呼叫 GetFormats 一份存於此 DataObject資料的有效格式清單。

另請參閱

• SetData(String, Boolean, Object)
• GetDataPresent(Type)
• DataFormats
• GetFormats(Boolean)

public:
 virtual System::Object ^ GetData(Type ^ format);

public virtual object GetData(Type format);

abstract member GetData : Type -> obj
override this.GetData : Type -> obj

Public Overridable Function GetData (format As Type) As Object

參數

傳回

與指定格式相關的資料，或 null。

實作

範例

以下程式碼範例取回儲存在 DataObject. 首先，會用一個元件建立一個新元件 DataObject 。 接著，資料會被檢索並指定其類型。 檢索資料的類型會顯示在文字框中。

這套規範要求已經建立。textBox1

private:
   void GetMyData()
   {
      // Creates a component to store in the data object.
      Component^ myComponent = gcnew Component;
      
      // Creates a new data object and assigns it the component.
      DataObject^ myDataObject = gcnew DataObject( myComponent );
      
      // Creates a type to store the type of data.
      Type^ myType = myComponent->GetType();
      
      // Retrieves the data using myType to represent its type.
      Object^ myObject = myDataObject->GetData( myType );
      if ( myObject != nullptr )
      {
         textBox1->Text = String::Format( "The data type stored in the DataObject is: {0}",
            myObject->GetType()->Name );
      }
      else
      {
         textBox1->Text = "Data of the specified type was not stored in the DataObject.";
      }
   }

private void GetMyData() {
    // Creates a component to store in the data object.
    Component myComponent = new Component();
 
    // Creates a new data object and assigns it the component.
    DataObject myDataObject = new DataObject(myComponent);
 
    // Creates a type to store the type of data.
    Type myType = myComponent.GetType();
 
    // Retrieves the data using myType to represent its type.
    Object myObject = myDataObject.GetData(myType);
    if(myObject != null)
       textBox1.Text = "The data type stored in the DataObject is: " +
       myObject.GetType().Name;
    else
       textBox1.Text = "Data of the specified type was not stored " +
       "in the DataObject.";
 }

Private Sub GetMyData()
    ' Creates a component to store in the data object.
    Dim myComponent As New Component()
    
    ' Creates a new data object and assigns it the component.
    Dim myDataObject As New DataObject(myComponent)
    
    ' Creates a type to store the type of data.
    Dim myType As Type = myComponent.GetType()
    
    ' Retrieves the data using myType to represent its type.
    Dim myObject As Object = myDataObject.GetData(myType)
    If (myObject IsNot Nothing) Then
        textBox1.Text = "The data type stored in the DataObject is: " & myObject.GetType().Name
    Else
        textBox1.Text = "Data of the specified type was not stored " & "in the DataObject."
    End If
End Sub

備註

若此方法找不到指定格式的資料，則嘗試將資料轉換成該格式。 若資料無法轉換為指定格式，或資料儲存時自動轉換為 false，則此方法會回傳 null。

要判斷資料是否與某種格式相關聯或可轉換成格式，請先GetData呼叫 GetDataPresent 。 請呼叫 GetFormats 一份存於此 DataObject資料的有效格式清單。

另請參閱

• SetData(String, Boolean, Object)
• Type
• GetDataPresent(Type)
• DataFormats
• GetFormats(Boolean)