/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// datagridviewrowerrortextneededeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this DataGridViewRowErrorTextNeededEventHandler datagridviewrowerrortextneededeventhandler, Object sender, DataGridViewRowErrorTextNeededEventArgs e, AsyncCallback callback)
{
if (datagridviewrowerrortextneededeventhandler == null)
{
throw new ArgumentNullException("datagridviewrowerrortextneededeventhandler");
}
return(datagridviewrowerrortextneededeventhandler.BeginInvoke(sender, e, callback, null));
}
public void DataGridViewRowErrorTextNeededEventArgs_ErrorText_Set_GetReturnsExpected(string value)
{
var dataGridView = new DataGridView
{
ColumnCount = 1,
VirtualMode = true
};
DataGridViewRow row = dataGridView.Rows[0];
int callCount = 0;
DataGridViewRowErrorTextNeededEventHandler handler = (sender, e) =>
{
callCount++;
e.ErrorText = value;
Assert.Equal(value, e.ErrorText);
};
dataGridView.RowErrorTextNeeded += handler;
Assert.Same(value, row.GetErrorText(0));
Assert.Equal(1, callCount);
}
