C# C组合框双重数据绑定-基于entityframework值选择项
我有几个表,使用实体框架6。我的目标是将类table1绑定到ComboBox值成员 ComboBox数据源是:C# C组合框双重数据绑定-基于entityframework值选择项,c#,entity-framework,data-binding,combobox,C#,Entity Framework,Data Binding,Combobox,我有几个表,使用实体框架6。我的目标是将类table1绑定到ComboBox值成员 ComboBox数据源是: ComboBoxBasicDB[] statType = new ComboBoxBasicDB[] { new ComboBoxBasicDB { Text = "A1", Value = 0 }, new ComboBoxBasicDB { Text = "A2", Value = 1 }, new Combo
ComboBoxBasicDB[] statType = new ComboBoxBasicDB[] {
new ComboBoxBasicDB { Text = "A1", Value = 0 },
new ComboBoxBasicDB { Text = "A2", Value = 1 },
new ComboBoxBasicDB { Text = "A3", Value = 2 },
new ComboBoxBasicDB { Text = "A4", Value = 4 },
new ComboBoxBasicDB { Text = "B12", Value = 12 },
new ComboBoxBasicDB { Text = "B13", Value = 13 },
new ComboBoxBasicDB { Text = "B14", Value = 14 }
};
statBS.DataSource = statType; // statBS == BindingSource, configured throught VS designer, comboBox.DataSource = statBS, comboBox.ValueMember = Value, comboBox.DisplayMember = Text
表1包含名为ex.Value1的属性,该属性包含0、1、2、4、12、13和14中的一个
我试图做的是从DB行加载,并在TextBox上使用类似的内容:
textBox.DataBindings.Add("Text", binding, "Name");
这很好用
我试过这样的方法:
comboBox.DataBindings.Add("SelectedValue", binding, "Value1");
但它不工作,查询后未选择任何内容。文本框绑定成功
我使用了SelectedIndex,但有一个问题,即值大于7,因为statType中有7项,而不是14项
我希望你明白我想做什么:/
我想我可以通过comboBox.DataManager来实现,但它是私有的
谢谢您的建议。所以解决方案是自定义实现,在提到的数据绑定中,将SelectedValue更改为SelectedItemValue 实施:
public class ComboBoxBasic : ComboBox
{
bool diffTextColor = false;
public ComboBoxBasic()
{
}
public object SelectedItemValue
{
get
{
return (SelectedItem as ComboBoxBasicDB).Value;
}
set
{
for(int i = 0; i < Items.Count; i++)
{
ComboBoxBasicDB item = Items[i] as ComboBoxBasicDB;
if(item.Value.ToString() == value.ToString())
{
SelectedIndex = i;
break;
}
}
}
}
public bool DifferentTextColor
{
get { return diffTextColor; }
set
{
diffTextColor = value;
if (diffTextColor)
{
DrawItem += ComboBoxBasic_DrawItem;
DrawMode = DrawMode.OwnerDrawFixed;
}
else
DrawItem -= ComboBoxBasic_DrawItem;
}
}
void ComboBoxBasic_DrawItem(object sender, DrawItemEventArgs e)
{
e.DrawBackground();
if (e.State == DrawItemState.Focus)
e.DrawFocusRectangle();
Brush brush = new SolidBrush((sender as Control).ForeColor);
ComboBoxBasicDB item = (sender as ComboBoxBasic).Items[e.Index] as ComboBoxBasicDB;
if (item.ForeColor != Brushes.Black)
brush = item.ForeColor;
e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
e.Graphics.DrawString(item.Text, (sender as Control).Font, brush, e.Bounds.X, e.Bounds.Y);
}
}
另外还有自定义DrawItem,如果它是由DifferentittextColor启用的您是否像我说的那样尝试过:comboBox.DataBindings.AddSelectedValue,binding,Value1;不工作:/n即使我尝试将按钮操作作为组合框。SelectedValue=14;