Detailed explanation of the automatic prompt, automatic completion and automatic completion functions of the TextBox input box in c# (pictures and text)

黄舟

Release： 2017-03-11 13:25:31

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Feature Overview

Detailed explanation of the automatic prompt, automatic completion and automatic completion functions of the TextBox input box in c# (pictures and text)

## Related Properties

TextBox.AutoCompleteCustomSource Property

Gets or sets the custom T:System.Collections.Specialized.StringCollection to use when the TextBox.AutoCompleteSource property is set to [CustomSource].

TextBox.AutoCompleteMode property

Gets or sets an option that controls how autocomplete is applied to a TextBox.

Property value Type: System.Windows.Forms.AutoCompleteMode
One of the AutoCompleteMode values. These values are shown below.
Append
Appends the remainder of the most likely candidate string to the existing characters and highlights the appended characters.
Suggest
Display the auxiliary drop-down list associated with the edit control. This drop-down list is populated with one or more suggested completion strings.
SuggestAppend
Append Suggest and Append options.
None
Disable autocomplete This is the default value.

TextBox.AutoCompleteSource property

Gets or sets a value that specifies the source of complete strings used for autocomplete.

Remarks

Use the AutoCompleteCustomSource, AutoCompleteMode, and AutoCompleteSource properties to create a TextBox that compares the entered prefix with the prefixes of all strings in the maintained source. Automatically complete input strings. This is useful for TextBox controls that frequently have URLs, addresses, file names, or commands entered into them.

Use of the AutoCompleteCustomSource property is optional, but the AutoCompleteSource property must be set to CustomSource to use AutoCompleteCustomSource.
The AutoCompleteMode and AutoCompleteSource properties must be used together.

Sample Code

The following code example demonstrates how to use a collection as an autocomplete custom source for a TextBox control.

This example will do the following:
Use the AutoCompleteSource property to enable the TextBox control to accept a custom source for its autocomplete behavior.
Use the AutoCompleteCustomSource property to set a custom list of values.
Use the AutoCompleteMode property to set how autocomplete candidates are displayed.

private void Form1_Load(object sender, EventArgs e)
        {            
        var source = new AutoCompleteStringCollection();
            source.AddRange(new string[]
                    {                        
                    "January",                        
                    "February",                        
                    "March",                        
                    "April",                        
                    "May",                        
                    "June",                        
                    "July",                        
                    "August",                        
                    "September",                        
                    "October",                        
                    "November",                        
                    "December"
                    });

            textBox1.AutoCompleteCustomSource = source;
            textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
        }

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