无法编辑使用 LINQ 查询结果填充的 DataGridView

发布于 2024-08-22 15:47:25 字数 656 浏览 5 评论 0原文

当我使用 linq-to-xml 查询的结果来填充 datagridview 时，我无法编辑 datagridview。我尝试将 datagridview 的只读属性设置为 false，但这没有帮助。我还为 cellBeginEdit 添加了一个事件处理程序，并在那里放置了一个断点，但它没有被命中。知道我做错了什么，或者这不可能吗？

public class MergeEntry
{
  public string author    { get; set; }
  public string message   { get; set; }
}
...
var query = from entry in xmlDoc.Descendants("entry")
            select new MergeEntry
            {
              author = entry.Element("author").Value,
              message = entry.Element("msg").Value,
            }
var queryAsList = query.ToList();

myBindingSource.DataSource = queryAsList;
myDataGridView.DataSource = myBindingSource;

原文

When i use the results of a linq-to-xml query to populate a datagridview, i cannot edit the datagridview. i've tried setting the datagridview's readonly property to false and that doesn't help. I also added an event handler for cellBeginEdit and put a breakpoint there, but it doesn't get hit. Any idea what i'm doing wrong, or if this isn't possible?

public class MergeEntry
{
  public string author    { get; set; }
  public string message   { get; set; }
}
...
var query = from entry in xmlDoc.Descendants("entry")
            select new MergeEntry
            {
              author = entry.Element("author").Value,
              message = entry.Element("msg").Value,
            }
var queryAsList = query.ToList();

myBindingSource.DataSource = queryAsList;
myDataGridView.DataSource = myBindingSource;

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玩套路吗 2024-08-29 15:47:25

是的，可以绑定到从 Linq-To-Xml 创建的列表。我试图重现你的问题。我执行了以下操作：

创建一个空的 WindForm 项目（VS 2008 和 .Net 3.5）
将 DataGridView 添加到表单。
连接 CellBeginEdit 和 CellEndEdit。
将以下代码放入 Form 的构造函数中

string testXML =
        @"<p><entry>
          <author>TestAuthor1</author>
          <msg>TestMsg1</msg>  
          </entry></p>
        ";

XElement xmlDoc = XElement.Parse(testXML);

var query = from entry in xmlDoc.Descendants("entry")
            select new MergeEntry
            {
                author = entry.Element("author").Value,
                message = entry.Element("msg").Value,
            }; //You were missing the ";" in your post, I am assuming that was a typo.

//I first binded to a List, that worked fine. I then changed it to use a BindingList
//to support two-way binding.
var queryAsList = new BindingList<MergeEntry>(query.ToList());

bindingSource1.DataSource = queryAsList;
dataGridView1.DataSource = bindingSource1;

运行 WinForm 应用程序时，会显示一个可编辑网格，并且会在应该触发的时候触发 CellBeginEdit 和 CellEndEdit 事件。希望使用上述步骤进行重现能够帮助您找到所面临的问题。

Yes, it is possible to bind to a list created from Linq-To-Xml. I tried to reproduce your problem. I did the following:

Created an empty WindForm project (VS 2008 and .Net 3.5)
Added a DataGridView to the Form.
Wired the CellBeginEdit and CellEndEdit.
Placed the following code in the Form's constructor

string testXML =
        @"<p><entry>
          <author>TestAuthor1</author>
          <msg>TestMsg1</msg>  
          </entry></p>
        ";

XElement xmlDoc = XElement.Parse(testXML);

var query = from entry in xmlDoc.Descendants("entry")
            select new MergeEntry
            {
                author = entry.Element("author").Value,
                message = entry.Element("msg").Value,
            }; //You were missing the ";" in your post, I am assuming that was a typo.

//I first binded to a List, that worked fine. I then changed it to use a BindingList
//to support two-way binding.
var queryAsList = new BindingList<MergeEntry>(query.ToList());

bindingSource1.DataSource = queryAsList;
dataGridView1.DataSource = bindingSource1;

When running the WinForm app, an editable grid was displayed and the CellBeginEdit and CellEndEdit events were fired when they should have been. Hopefully trying to reproduce using the above steps will help you locate the issue you are facing.

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