C# VSTO 字 AddIn 抛出值未落在预期错误范围内

Question

我是 VSTO word Addin 的新手，最终目标是检查自定义文档属性是否存在。在线阅读所有可用文章，没有任何突破。

从此代码开始

public void chk()
{
   if (this.Application.ActiveDocument.CustomDocumentProperties["ObjectType"].Value = 0)
   {
      MessageBox.Show("Please select an object");
   }
}

这会引发错误

值不在范围内错误

将代码修改为创建一个自定义文档属性对象，如下所示，它给了我同样的错误

if(this.Application.ActiveDocument.CustomDocumentProperties["ObjectType"].Value = 0)

public void chk()
{
      dynamic properties = null;
      properties = this.Application.ActiveDocument.CustomDocumentProperties;
      properties.Add("Name",false,Office.MsoDocProperties.msoPropertyTypeString, "ObjectType");
      properties.Add("LinkToContent",false, Office.MsoDocProperties.msoPropertyTypeBoolean,false);
      properties.Add("Type",false,Office.MsoDocProperties.msoPropertyTypeNumber, 0);
                   
      if(this.Application.ActiveDocument.CustomDocumentProperties["ObjectType"].Value = 0)
      {
          MessageBox.Show("Please select an object");
       }
}

请求您建议解决问题的步骤。如果需要更多信息，请告诉我。

Answer 1

您可以迭代所有属性并检查它们的名称，比较两种方法：

void TestProperties()
{
    Microsoft.Office.Core.DocumentProperties properties;
    properties = (Office.DocumentProperties)this.CustomDocumentProperties;

    if (ReadDocumentProperty("Project Name") != null)
    {
        properties["Project Name"].Delete();
    }

    properties.Add("Project Name", false,
        Microsoft.Office.Core.MsoDocProperties.msoPropertyTypeString,
        "White Papers");
}

private string ReadDocumentProperty(string propertyName)
{
    Office.DocumentProperties properties;
    properties = (Office.DocumentProperties)this.CustomDocumentProperties;

    foreach (Office.DocumentProperty prop in properties)
    {
        if (prop.Name == propertyName)
        {
            return prop.Value.ToString();
        }
    }
    return null;
}