Question

我在向组合框输入文字时尝试构建一个组合框过滤器，它显示下拉列表以及组合列表中的匹配值我从这里使用了指南：C# Adding Filter to combobox dropdown list 但是我注意到，当我键入组合列表中没有匹配值的字符，然后按Enter或单击鼠标时，它会抛出Exception类型的 System.ArgumentOutOfRangeException并说InvalidArgument = Value 这是我的代码：

private void comboBox1_TextUpdate(object sender, EventArgs e)
        {
            try
            {
                comboBox1.DroppedDown = true;
                Cursor.Current = Cursors.Default;
                string filter_param = comboBox1.Text;

                string[] filteredItems = Array.FindAll(arrProjectList, c => c.Contains(filter_param));  //'arrProjectList' is a global string array that holds and fills the combobox values
                // another variant for filtering using StartsWith:
                //List<string> filteredItems = arrProjectList.FindAll(x => x.StartsWith(filter_param));

                comboBox1.DataSource = filteredItems;

                if (string.IsNullOrWhiteSpace(filter_param))
                {
                    comboBox1.DataSource = filteredItems;
                }
                comboBox1.DroppedDown = true;

                // this will ensure that the drop down is as long as the list
                comboBox1.IntegralHeight = true;

                // remove automatically selected first item
                comboBox1.SelectedIndex = -1;

                comboBox1.Text = filter_param;

                // set the position of the cursor
                comboBox1.SelectionStart = filter_param.Length;
                comboBox1.SelectionLength = 0;

                //comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
                //comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            }
            catch
            {
                MessageBox.Show("error");
            }
        }

我没有在指南中找到解决方案。如何解决？

组合框下拉列表超出范围异常

0 个答案: