问题描述
假设我有一个这样的数据表: DataTable dt = new DataTable(Woot);
dt.Columns.AddRange(new DataColumn [] {
new DataColumn(ID,typeof(System.Guid)),
new DataColumn(Name,typeof (String))
});
当我尝试绑定控件时:
this.txtName.DataBindings.Add(Text,_dtRow,Name);
我收到这个例外:
任何想法,为什么这对datAdapter创建的数据表有效,但不是编程创建一个?
好的,在搞砸你的代码一段时间后,我一直在被困扰。然后我终于意识到了这个问题。我假设_dtRow是一个DataRow。您需要参考实际的DataTable(dt)。
this.textBox1.DataBindings.Add(Text,dt,Name);
编辑:看到您对Igor发表的评论后。如果绑定到dt,那么说如果你有一个datagridview绑定到这个DataTable,每次你选择一个不同的行,文本框会改变。
这是代码适用于我:
DataTable dt = new DataTable(Woot);
dt.Columns.AddRange(new DataColumn [] {
new DataColumn(ID,typeof(System.Guid)),
new DataColumn(Name,typeof (String))
});
dt.Rows.Add(Guid.NewGuid(),John);
dt.Rows.Add(Guid.NewGuid(),Jack);
this.dataGridView1.DataSource = dt;
this.textBox1.DataBindings.Add(Text,dt,Name);
更改DGV中的行,您将看到文本框更改文本。
EIDT AGAIN 确定,时间到了。这是我如何工作:
this.textBox1.DataBindings.Add(Text,_ dtRow.ItemArray [1 ],);
我使用索引1,但可以使用数组中需要的任何索引。
Suppose I have a datatable like this:
DataTable dt = new DataTable("Woot");
dt.Columns.AddRange(new DataColumn[]{
new DataColumn("ID",typeof(System.Guid)),
new DataColumn("Name",typeof(String))
});
When I try to bind a control to it:
this.txtName.DataBindings.Add("Text", _dtRow, "Name");
I get this exception:
Any idea why this works on a datatable created by a dataAdapter, but not on a programmaticly created one?
OK, after messing with your code for a while, I kept getting stumped. Then I finally realized the issue. I'm assuming _dtRow is a DataRow. You need to reference the actual DataTable (dt).
this.textBox1.DataBindings.Add("Text", dt, "Name");
EDIT: After seeing your comment on Igor's post. If you bind to dt, then say for example if you have a datagridview bound to this DataTable, every time you select a different row, the textbox will change.
Here's the code that works for me:
DataTable dt = new DataTable("Woot");
dt.Columns.AddRange(new DataColumn[]{
new DataColumn("ID",typeof(System.Guid)),
new DataColumn("Name",typeof(String))
});
dt.Rows.Add(Guid.NewGuid(), "John");
dt.Rows.Add(Guid.NewGuid(), "Jack");
this.dataGridView1.DataSource = dt;
this.textBox1.DataBindings.Add("Text", dt, "Name");
Change rows in the DGV and you'll see the textbox change text.
EIDT AGAIN OK, time to hack it. This is how I got it to work:
this.textBox1.DataBindings.Add("Text",_dtRow.ItemArray[1], "");
I used index 1, but you can use whatever index you need in the array.
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