绑定的复选框不会更新其数据源

Question

我有一个复选框，它的选中值被绑定到一个绑定源，该绑定源被绑定到一个布尔数据表列。当我单击保存按钮将数据表中的更改推送到sql服务器时，数据表中的值永远不会更改。

设计器代码。

this.cbxKeepWebInfinityChanges = new System.Windows.Forms.CheckBox();
this.preProductionBindingSource = new System.Windows.Forms.BindingSource();
// 
// cbxKeepWebInfinityChanges
// 
this.cbxKeepWebInfinityChanges.AutoSize = true;
this.cbxKeepWebInfinityChanges.DataBindings.Add(new System.Windows.Forms.Binding("Checked", this.preProductionBindingSource, "WEBINFINTY_CHANGES", true, System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged));
this.cbxKeepWebInfinityChanges.Location = new System.Drawing.Point(6, 98);
this.cbxKeepWebInfinityChanges.Name = "cbxKeepWebInfinityChanges";
this.cbxKeepWebInfinityChanges.Size = new System.Drawing.Size(152, 17);
this.cbxKeepWebInfinityChanges.TabIndex = 30;
this.cbxKeepWebInfinityChanges.Text = "Keep WebInfinity Changes";
this.cbxKeepWebInfinityChanges.UseVisualStyleBackColor = true;
this.cbxKeepWebInfinityChanges.CheckedChanged += new System.EventHandler(this.CauseApplyChangesActivation);
// 
// preProductionBindingSource
// 
this.preProductionBindingSource.AllowNew = false;
this.preProductionBindingSource.DataMember = "PreProduction";
this.preProductionBindingSource.DataSource = this.salesLogix;

保存代码

//the comments are the debugger values before the call in going from checked when loaded to unchecked when saved.
private void btnApplyChanges_Click(object sender, EventArgs e)
{
    (...) // non related saving logic for other controls
    preProductionBindingSource.EndEdit(); // checked = false, databinding = true, datatable = true
    preProductionTableAdapter.Update(salesLogix.PreProduction); // checked = false, databinding = true, datatable = true
}

当从未选中状态变为已选中状态时，也会发生同样的情况。我绑定到相同数据绑定源(我有两个组合框)的其他项正在正确更新。

编辑--在preProductionBindingSource.EndEdit();之前添加cbxKeepWebInfinityChanges.DataBindings["Checked"].WriteValue();不会更改任何内容。

Answer 1

我使用了another one of my questions中Dathan的建议，我试图将数据库中的文本Yes/No字段绑定到这个复选框。我把它改回一个普通的查询，并使用了Binding.Parse和Binding.Format，它解决了我的问题。

下面是一些示例代码。

Public Form1()
{
    InitializeComponent();
    cbxKeepWebInfinityChanges.DataBindings["Checked"].Parse += new ConvertEventHandler(cbxKeepWebInfinityChanges_Parse);
    cbxKeepWebInfinityChanges.DataBindings["Checked"].Format += new ConvertEventHandler(cbxKeepWebInfinityChanges_Format);
}

void cbxKeepWebInfinityChanges_Parse(object sender, ConvertEventArgs e)
{
    if ((bool)e.Value == true)
        e.Value = "Yes";
    else
        e.Value = "No";
}
void cbxKeepWebInfinityChanges_Format(object sender, ConvertEventArgs e)
{
    if ((string)e.Value == "Yes")
        e.Value = true;
    else
        e.Value = false;
}