“绑定”复选框不更新其数据源 [英] Bound checkbox does not update its datasource

问题描述

我有一个复选框，被检查的值被绑定到一个绑定到一个布尔数据表列的源。当我点击我的保存按钮将我的数据表中的更改推送到我的sql服务器时，数据表中的值不会更改。

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 =保持WebInfinity更改; 
 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

 code> //注释是在保存之前加载到未选中的调用之前调用的调试器值。 
 private void btnApplyChanges_Click（object sender，EventArgs e）
 {
（...）//其他控件的非相关保存逻辑
 preProductionBindingSource.EndEdit（）; // checked = false，databinding = true，datatable = true 
 preProductionTableAdapter.Update（salesLogix.PreProduction）; // checked = false，databinding = true，datatable = true 
} 
  

发生在从未检查到检查时。我已经绑定到同一数据绑定源（我有两个组合框）的其他项目正确更新。

编辑 -
添加 cbxKeepWebInfinityChanges.DataBindings [Checked]。在$ code> preProductionBindingSource.EndEdit（）; 之前没有更改任何内容的WriteValue（）; p>

解决方案

我在使用Dathan的建议，从另一个我的问题，我试图将数据库中的一个文本是/否字段绑定到此复选框。我将其更改为正常的查询，并使用 Binding.Parse 和 Binding.Format ，并解决了我的问题。 / p>

以下是一些示例代码。

  Public Form1（）
 {
 InitializeComponent（）; 
 cbxKeepWebInfinityChanges.DataBindings [Checked]。Parse + = new ConvertEventHandler（cbxKeepWebInfinityChanges_Parse）; 
 cbxKeepWebInfinityChanges.DataBindings [Checked]。格式+ = new ConvertEventHandler（cbxKeepWebInfinityChanges_Format）; 
} 
 
 void cbxKeepWebInfinityChanges_Parse（object sender，ConvertEventArgs e）
 {
 if（（bool）e.Value == true）
 e.Value =是; 
 else 
 e.Value =否; 
} 
 void cbxKeepWebInfinityChanges_Format（object sender，ConvertEventArgs e）
 {
 if（（string）e.Value ==Yes）
 e.Value = true ; 
 else 
 e.Value = false; 
} 
  

I have a checkbox who's checked value is bound to a binding source which is bound to a boolean data table column. When I click my save button to push my changes in my data table to my sql server the value in the data table is never changed.

Designer code.

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;

Save Code

//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
}

The same things happens when going from unchecked to checked. Other items I have bound to the same data-binding source (I have two combo boxes) are updating correctly.

EDIT -- Adding cbxKeepWebInfinityChanges.DataBindings["Checked"].WriteValue(); before the preProductionBindingSource.EndEdit(); did not change anything.

解决方案

I was using Dathan's suggestion from another one of my questions, I was trying to bind a text Yes/No field in the database to this check box. I changed it back to a normal query and used Binding.Parse and Binding.Format and it solved my issue.

Here is some sample code.

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;
}

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