c# - dataGridView BindingContextChanged 事件不与 dataGridView 数据源更改同步,Winform
问题描述
我遇到了 dataGridViewBindingContextChanged
事件触发的问题。我在表单中有 2 个 datagridview,并为两个网格实现了 BindingContextChanged 事件。
在 BindGrid 方法上,grid1 首先与数据源绑定,但 grid2 的 BindingContextChanged 事件首先触发,然后是 grid1,然后在 grid2 与其他数据源绑定后,grid2 BindingContextChanged 事件不会触发。我不知道为什么会发生这种情况,我需要每个 BindingContextChanged 事件应该在各自的网格数据源分配之后触发。请帮我解决这个问题。
下面是示例代码
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.dataGridView1.BindingContextChanged += new System.EventHandler(this.dataGridView1_BindingContextChanged);
this.dataGridView2.BindingContextChanged += new System.EventHandler(this.dataGridView2_BindingContextChanged);
}
private void btnBind_Click(object sender, EventArgs e)
{
BindGrid();
}
protected void BindGrid()
{
DataTable dt1 = new DataTable();
dt1.Columns.Add("ID", typeof(int));
dt1.Rows.Add(1);
dt1.Rows.Add(2);
dt1.Rows.Add(3);
BindingSource dataSource = new BindingSource(dt1, null);
dataGridView1.DataSource = dataSource;
DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(int));
dt.Rows.Add(1);
dt.Rows.Add(2);
dt.Rows.Add(3);
BindingSource dataSource1 = new BindingSource(dt, null);
dataGridView2.DataSource = dataSource1;
}
private void dataGridView1_BindingContextChanged(object sender, EventArgs e)
{
// Continue only if the data source has been set.
if (dataGridView1.DataSource == null)
{
return;
}
}
private void dataGridView2_BindingContextChanged(object sender, EventArgs e)
{
// Continue only if the data source has been set.
if (dataGridView2.DataSource == null)
{
return;
}
}
}
解决方案
我能够重现这个问题。我从BindingContextChanged
事件处理程序更改为DataSourceChanged
,这解决了这个问题。例如
this.dataGridView1.BindingContextChanged += new System.EventHandler(this.dataGridView1_BindingContextChanged);
this.dataGridView2.BindingContextChanged += new System.EventHandler(this.dataGridView2_BindingContextChanged);
至...
this.dataGridView1.DataSourceChanged += new System.EventHandler(this.dataGridView1_DataSourceChanged);
this.dataGridView2.DataSourceChanged += new System.EventHandler(this.dataGridView2_DataSourceChanged);
当事件触发时, nowdataGridView1.DataSource
不为空,并且每个都根据修改后的绑定源触发。