Question

收到此错误Items collection must be empty before using ItemsSource.

此行中出现此错误：

BuildstreamComboBox.ItemsSource = dz;

代码：

    public void PopulatebuildstreamFromXMLFile()
    {
        if (BuildmachineComboBox.SelectedIndex == 0)
        {
            ds3.Clear();
            ds3.ReadXml(@"C:\GUI\buildermanageremail.xml");

            DataView dy = ds3.Tables["buildstream4"].DefaultView;

            BuildstreamComboBox.ItemsSource = dy; //Sets the collection of items from which to populate
            BuildstreamComboBox.DisplayMemberPath = "value"; //Sets the path within an item to use for display
        }
        if (BuildmachineComboBox.SelectedIndex == 1)
        {
            ds3.Clear();
            ds3.ReadXml(@"C:\GUI\buildermanageremail.xml");

            DataView dz = ds3.Tables["buildstream5"].DefaultView;

            BuildstreamComboBox.ItemsSource = dz; //Sets the collection of items from which to populate
            BuildstreamComboBox.DisplayMemberPath = "value"; //Sets the path within an item to use for display
        }
    }

ds3的定义：

DataSet ds3 = new DataSet();

任何人都有任何想法？

Answer 1

您的问题本身包含您的答案，您需要在为其分配新项目源之前清除项目集合，请点击此处 - BuildstreamComboBox.Items.Clear()

无效操作异常未处理

1 个答案: