Get EditValue from control's DataBindings

问题

I have TextEdit Control and it is bound to a class field from Datasource, so it is looks like EditValue - bindingSource1.MyClassField. Can I somehow get the type of EditValue via code?

I've found that textEdit1.DataBindings[0].BindableComponent has EditValue that I need, but it seems to be private, and textEdit1.DataBindings[0].BindingMemberInfo contains only string values.

回答1:

you have to cast the bindingsource current to a DataRowView.

object Result = null;

DataRowView drv = bindingSource1.Current as DataRowView;
if (drv != null)
{
    // get the value of the field
    Result = drv.Row["columnName"];

    // show the type if this value
    MessageBox.Show(Result.GetType().ToString());
}

Since this gets the value from the bindingsource it does not matters what controls are binded to it. It will work for TextEdits just as well as for a DataGridView.

EDIT:
Another way to get the type is this : (this will only work if EditValue is not null)

object test;
test = textEdit1.EditValue;
MessageBox.Show(test.GetType().ToString());

EDIT:
I found a way to find the information from the databinding, so it should also work when the EditValue of textEdit1 is still null.

PropertyDescriptorCollection info = textEdit1.DataBindings[0].BindingManagerBase.GetItemProperties();
string fieldname = textEdit1.DataBindings[0].BindingMemberInfo.BindingField;

MessageBox.Show(info[fieldname].Name + " : " + info[fieldname].PropertyType.ToString());

I found this on this page:
https://msdn.microsoft.com/en-us/library/kyaxdd3x(v=vs.110).aspx#Examples

来源：https://stackoverflow.com/questions/44839836/get-editvalue-from-controls-databindings

标签

winforms

data-binding

devexpress