| 发表于：2007-10-15 08:46:25 楼主 |
1. 我定义了一个自定义组件如下：
using system;
using system.collections.generic;
using system.componentmodel;
using system.drawing;
using system.data;
using system.text;
using system.windows.forms;
using system.collections;
namespace jxerpcomponent
{
public partial class jxlabelcombobox : usercontrol
{
public jxlabelcombobox（)
{
initializecomponent（);
this.databindings.collectionchanged+=new collectionchangeeventhandler （databindings_collectionchanged);
}
void databindings_collectionchanged（object sender, collectionchangeeventargs e)
{
if （（e.action == collectionchangeaction.add) && （e.element != null) && （（e.element as binding).propertyname == "selectvalue")) //text
{
binding bd = new binding（"selectedvalue", （e.element as binding).datasource, （e.element as binding).bindingmemberinfo.bindingfield);
this.combobox.databindings.add（bd);
}
}
private object selectvalue;
public object selectvalue
{
get {
this.selectvalue = this.combobox.selectedvalue;
return this.selectvalue;
}
set
{
this.selectvalue = value;
this.combobox.selectedvalue = value;
this.invalidate（);
}
}
}
做了一个测试范例：
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;
using system.collections;
namespace componenttest
{
public partial class frmjxcontrol : form
{
public frmjxcontrol（)
{
initializecomponent（);
}
private void frmjxcontrol_load（object sender, eventargs e)
{
arraylist al = new arraylist（);
al.add（new a（"a1",1));
al.add（new a（"a2",2));
al.add（new a（"a3", 3));
arraylist b1 = new arraylist（);
b1.add（new b（"b1",1));
b1.add（new b（"b2", 2));
this.datagridview1.datasource = al;
this.combobox1.datasource = b1;
this.combobox1.displaymember = "b1";
this.combobox1.valuemember = "c2";
this.combobox1.databindings.add（"selectedvalue", al, "c2");
this.jxlabelcombobox2.datasource = b1;
this.jxlabelcombobox2.displaymember = "b1";
this.jxlabelcombobox2.valuemember = "c2";
this.jxlabelcombobox2.datapropertyname = "c2";
this.jxlabelcombobox2.databindings.add（"selectvalue", al, "c2");
this.jxlabelcombobox2.enabled = true;
}
}
public class a
{
public a（string vc1, int vc2)
{
c1 = vc1;
c2 = vc2;
}
private string c1;
public string c1
{
get { return c1; }
set { c1 = value; }
}
private int c2;
public int c2
{
get { return c2; }
set { c2 = value; }
}
}
public class b
{
public b（string vb1, int vc2)
{
b1 = vb1;
c2 = vc2;
}
private string b1;
public string b1
{
get { return b1; }
set { b1 = value; }
}
private int c2;
public int c2
{
get { return c2; }
set { c2 = value; }
}
}
}
问题：
每次从grid的第三行跳到第二行时都回报错。
请高手指教。
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