Winforms 文本框在跳出其他控件时重置文本

我有一个有几个控件的窗体。存在禁用“textBoxOtherRelationship”并将文本设置为string.empty的情况。但是，当我转到另一个控件并进行制表时，数据再次出现，而该控件仍处于禁用状态

textBoxOtherRelationship.DataBindings.Add(new Binding("Text", _binder, "RelationshipNotes"));


  private void ComboBoxRelationShipSelectedValueChanged(object sender, EventArgs e)
        {
            if ((Constants.Relationship)comboBoxRelationShip.SelectedItem.DataValue == Constants.Relationship.Other)
            {
                textBoxOtherRelationship.Enabled = true;
                if (_formMode != ActionMode.ReadOnly)
                {
                    textBoxFirstName.BackColor = Color.White;
                }
            }
            else
            {
                textBoxOtherRelationship.Enabled = false;
                _model.RelationshipNotes = null;
                textBoxOtherRelationship.Text = string.Empty;
                if (_formMode != ActionMode.ReadOnly)
                {
                    textBoxFirstName.BackColor = Color.LightYellow;
                }
            }
        }

---

嗯。。所以我在这里看到这一行：

textBoxOtherRelationship.DataBindings.Add(
  new Binding("Text", _binder, "RelationshipNotes"));

这说明您已经在textBoxOtherRelationship上的

Text

属性和datasource

\u binder

上名为“RelationshipNotes”的属性之间设置了绑定

太好了

因此，我假设双向绑定工作正常，并且当您在

textBoxOtherRelationship

中键入某个内容，并且该控件失去焦点时，基础RelationshipNotes属性也会得到更新，对吗

现在，看看您的代码，我认为当您将

Text

属性设置为

string.Empty

时，底层数据源不会被更新，因为在文本框失去焦点并且禁用控件之前，通常不会发生这种情况

如果您添加：

textBoxOtherRelationship.DataBindings[0].WriteValue();

将值设置为

string.Empty

后，该字符串将被存储回数据源，因为数据绑定将知道有东西要更新。从编程角度来说，它不是

我看你有这句话：

            textBoxOtherRelationship.Enabled = false;
            _model.RelationshipNotes = null; <<<----------------------
            textBoxOtherRelationship.Text = string.Empty;

textBoxOtherRelationship.Enabled=false；
_model.RelationshipNotes=null SelectedIndexChanged事件在控件失去焦点之前不会提交数据绑定，因此快速修复方法是先在事件中写入值：

private void ComboBoxRelationShipSelectedValueChanged(object sender, EventArgs e)
{
  if (comboBoxRelationShip.DataBindings.Count > 0) {
    comboBoxRelationShip.DataBindings[0].WriteValue();

    if ((Constants.Relationship)comboBoxRelationShip.SelectedItem.DataValue ==
                                                 Constants.Relationship.Other) {
      textBoxOtherRelationship.Enabled = true;
      if (_formMode != ActionMode.ReadOnly) {
        textBoxFirstName.BackColor = Color.White;
      }
    } else {
      textBoxOtherRelationship.Enabled = false;
      _model.RelationshipNotes = null;
      textBoxOtherRelationship.Text = string.Empty;
      if (_formMode != ActionMode.ReadOnly) {
        textBoxFirstName.BackColor = Color.LightYellow;
      }
    }
  }
}