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TextBox obj = SelectBox as TextBox;
//插入到光标处
int ci = obj.CaretIndex;
if (ci > 0 && ci == obj.Text.Length)
{
obj.Text = obj.Text.Substring(0, ci - 1);
obj.CaretIndex = ci - 1;
}
else if (ci > 0)
{
obj.Text = obj.Text.Substring(0, ci - 1) + obj.Text.Substring(ci);
obj.CaretIndex = ci - 1;
}
obj.Focus();