Having issue with slow typing in Windows Forms App

问题

I am writing a Windows Forms App with a ComboBox. It is a DropDownList with SuggestAppend. When the user types, it should position to the item meeting the keyed letters. If they type reasonably fast, this works as expected. If there is even a short delay in keystrokes, it starts over thinking it is a different value. Unfortunately, I have a number of one fingered typists (not even two fingers) and they can't type fast enough.

Here is the code as the designer created it...

this.cbxItemDescription.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend;
this.cbxItemDescription.AutoCompleteSource = sysem.Windows.Forms.AutoCompleteSource.ListItems;
this.cbxItemDescription.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
this.cbxItemDescription.FormattingEnabled = true;
this.cbxItemDescription.Location = new System.Drawing.Point(75, 2);
this.cbxItemDescription.Name = "cbxItemDescription";
this.cbxItemDescription.Size = new System.Drawing.Size(300, 21);
this.cbxItemDescription.TabIndex = 2;
this.cbxItemDescription.Visible = false;
this.cbxItemDescription.SelectedIndexChanged += new System.EventHandler(this.cbxItemDescription_SelectedIndexChanged);`

It is loaded by the line...

cbxItemDescription.Items.Add(value to be added);

Can anyone tell me how to extend the interval so it can accommodate these slow typists?

I have found answers for WPF ComboBoxes but unless I am not understanding the solution, they won't work for Windows Forms.

来源：https://stackoverflow.com/questions/54173989/having-issue-with-slow-typing-in-windows-forms-app