给绑定数据源的文本输入框TextEdit.Text或EditValue属性赋值，失去焦点文本自动清空了-开发框架文库

给绑定数据源的文本输入框TextEdit.Text或EditValue属性赋值，失去焦点文本自动清空了

标签：

给绑定数据源的文本输入框TextEdit.Text或EditValue属性赋值，失去焦点文本自动清空了

被清空的原因：

当文本输入框组件绑定数据源时，直接給Text, EditValue属性赋值是无效的，因为没有写入数据到数据源。

必须使用DataBinding.WriteValue方法写入数据。

解决方案1：赋值后，使用WriteValue方法。

C# Code:

//模拟给TextEdit赋值
private void button1_Click(object sender, EventArgs e)
{
//textEdit1.Text = "www.CSFramework.com";
textEdit1.EditValue = "www.CSFramework.com";

//使用此方法正常！
//WriteValue：读取控件属性的当前值并将其写入数据源
textEdit1.DataBindings[0].WriteValue();
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

解决方案2：封装1个自定义方法赋值，比如SetEditorBindingValue。

C# Code:

//模拟给TextEdit赋值
private void button2_Click(object sender, EventArgs e)
{
//textEdit1.EditValue = "www.CSFramework.com";
//textEdit1.Text = "www.CSFramework.com";

SetEditorBindingValue(textEdit1, "www.CSFramework.com");
}

/// <summary>
/// 给绑定数据源的组件赋值
/// </summary>
/// <param name="bindingControl"></param>
/// <param name="value"></param>
protected void SetEditorBindingValue(BaseEdit bindingControl, object value)
{
//bindingControl.Text = value;
bindingControl.EditValue = value;

if (bindingControl.DataBindings.Count > 0)
{
bindingControl.DataBindings[0].WriteValue();
}
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

C/S系统快速开发框架绑定数据源的自定义方法：

C# Code:

/// <summary>
/// 绑定输入控件的数据源
/// </summary>
/// <param name="edit">控件框</param>
/// <param name="dataSource">数据源</param>
/// <param name="bindField">取值字段</param>
public void BindingTextEditBase(BaseEdit edit, object dataSource, string bindField)
{
try
{
edit.DataBindings.Clear();
Binding b = new Binding("EditValue", dataSource, bindField);
edit.DataBindings.Add(b);
b.ReadValue();
}
catch (Exception ex)
{
//
}
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

C# Code:

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

/// <summary>
/// 绑定输入控件的数据源
/// </summary>
/// <param name="edit">控件框</param>
/// <param name="dataSource">数据源</param>
/// <param name="bindField">取值字段</param>
public void BindingTextEditBase(BaseEdit edit, object dataSource, string bindField)
{
try
{
edit.DataBindings.Clear();
Binding b = new Binding("EditValue", dataSource, bindField);
edit.DataBindings.Add(b);
b.ReadValue();
}
catch (Exception ex)
{
//
}
}

private void Form1_Load(object sender, EventArgs e)
{
MyCustomer customer = new MyCustomer
{
CustomerCode = "CSFramework.com",
CustomerName = "C/S框架网"
};

//绑定数据源
BindingTextEditBase(textEdit1, customer, "CustomerCode");
BindingTextEditBase(textEdit2, customer, "CustomerName");
}

public class MyCustomer
{
public string CustomerName { get; set; }
public string CustomerCode { get; set; }
}

//模拟给TextEdit赋值
private void button1_Click(object sender, EventArgs e)
{

textEdit1.EditValue = "www.CSFramework.com";

//使用此方法正常！
//WriteValue：读取控件属性的当前值并将其写入数据源
textEdit1.DataBindings[0].WriteValue();
}

//模拟给TextEdit赋值
private void button2_Click(object sender, EventArgs e)
{
//textEdit1.EditValue = "www.CSFramework.com";
//textEdit1.Text = "www.CSFramework.com";

SetEditorBindingValue(textEdit1, "www.CSFramework.com");
}

/// <summary>
/// 给绑定数据源的组件赋值
/// </summary>
/// <param name="bindingControl"></param>
/// <param name="value"></param>
protected void SetEditorBindingValue(BaseEdit bindingControl, object value)
{
//bindingControl.Text = value;
bindingControl.EditValue = value;

if (bindingControl.DataBindings.Count > 0)
{
bindingControl.DataBindings[0].WriteValue();
}
}

private void textEdit1_EditValueChanged(object sender, EventArgs e)
{
//
}
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

扫一扫加微信：

原文链接：https://www.cscode.net/archive/newdoc/cs-210903193613148-37.html

NewDoc C/S框架网 2020-03-19 23:04 2020-03-19 23:11