圖紙部分未被添加到WorksheetPart。指定參數超出有效值範圍

Question

使用Open Xml SDK，我在WorksheetPart中添加了一個DrawingsPart，後來我嘗試引用WorksheetPart內的DrawingsPart，但我收到了ArgumentOutOfRangeException。

下面是代碼中的相關片段：

// Add a new drawings part to the worksheet 
var drawingsPart = worksheetPart.AddNewPart<DrawingsPart>(); 

// make a drawing DOM 
var drawingRootElement = new WorksheetDrawing(); 

// add to the drawing DOM 
... 

// and then... 
// associate the drawing DOM to the drawings part 
drawingsPart.WorksheetDrawing = drawingRootElement; 

// save the drawing DOM back to the drawings part 
drawingsPart.WorksheetDrawing.Save(); 

// and finally... 
// here is where it throws the ArgumentOutOfRangeException 
// whether I supply the drawingsPart as the argument 
// or the value worksheet.DrawingsPart 
// it reports the same exception 
// I looked up the source of OpenXmlPartContainer.GetIdOfPart 
// and it looks like the DrawingsPart is not yet added to the 
// PartDictionary of the WorksheetPart. I wonder why? 
var relationshipIdOfDrawingsPart = drawingsPart 
          .GetIdOfPart(worksheetPart.DrawingsPart /* drawingsPart */); 


// Create a new drawing element and add it to the Worksheet DOM 
var drawingElement = new DocumentFormat.OpenXml.Spreadsheet.Drawing { Id = relationshipIdOfDrawingsPart }; 
worksheetPart.Worksheet.Append(drawingElement); 

異常詳細信息：

System.ArgumentOutOfRangeException發生的HResult = 0x80131502
消息=指定參數超出有效範圍的值。
源= DocumentFormat.OpenXml堆棧跟蹤：在在 DocumentFormat.OpenXml.Packaging.OpenXmlPartContainer.GetIdOfPart（OpenXmlPart 部分）......我的代碼

我擡頭的OpenXmlPartContainer.GetIdOfPart源（轉載如下）：

// DocumentFormat.OpenXml.Packaging.OpenXmlPartContainer 
/// <summary> 
/// Gets the relationship ID of the part. 
/// </summary> 
/// <param name="part">The part.</param> 
/// <returns>The relationship ID of the part.</returns> 
/// <exception cref="T:System.ArgumentNullException">Thrown when "part" is null reference.</exception> 
/// <exception cref="T:System.ArgumentOutOfRangeException">Thrown when the part does not exist.</exception> 
public string GetIdOfPart(OpenXmlPart part) 
{ 
    this.ThrowIfObjectDisposed(); 
    if (part == null) 
    { 
     throw new ArgumentNullException("part"); 
    } 
    if (this.PartDictionary.ContainsValue(part)) 
    { 
     foreach (KeyValuePair<string, OpenXmlPart> current in this.PartDictionary) 
     { 
      if (part == current.Value) 
      { 
       return current.Key; 
      } 
     } 
    } 
    throw new ArgumentOutOfRangeException("part"); 
} 

它看起來像DrawingsPart沒有被添加到WorksheetPart的PartDictionary。我想知道爲什麼？

Answer 1

鑑於worksheetPart.DrawingsPart和drawingsPart是同一個對象，這個代碼是沒有意義的：

// and finally... 
// here is where it throws the ArgumentOutOfRangeException 
// whether I supply the drawingsPart as the argument 
// or the value worksheet.DrawingsPart 
// it reports the same exception 
// I looked up the source of OpenXmlPartContainer.GetIdOfPart 
// and it looks like the DrawingsPart is not yet added to the 
// PartDictionary of the WorksheetPart. I wonder why? 
var relationshipIdOfDrawingsPart = drawingsPart 
          .GetIdOfPart(worksheetPart.DrawingsPart /* drawingsPart */); 

因爲如果該對象的PartDictionary載到本身參考，只會工作。

因此，您需要改爲在父對象上調用GetIdOfPart，而不是drawingsPart本身。