我希望有一个文本框控件,可以使用C#2008和LINQ在Windows应用程序中建议和附加数据库中的值。
我是用组合框做的,但我不能用文本框来做。
我该怎么做?
答案 0 :(得分:36)
这可能不是最好的做事方式,但应该有效:
this.textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
this.textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
private void textBox1_TextChanged(object sender, EventArgs e)
{
TextBox t = sender as TextBox;
if (t != null)
{
//say you want to do a search when user types 3 or more chars
if (t.Text.Length >= 3)
{
//SuggestStrings will have the logic to return array of strings either from cache/db
string[] arr = SuggestStrings(t.Text);
AutoCompleteStringCollection collection = new AutoCompleteStringCollection();
collection.AddRange(arr);
this.textBox1.AutoCompleteCustomSource = collection;
}
}
}
答案 1 :(得分:11)
查看AutoCompleteSource
,AutoCompleteCustomSource
和AutoCompleteMode
属性。
textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
AutoCompleteStringCollection col = new AutoCompleteStringCollection();
col.Add("Foo");
col.Add("Bar");
textBox1.AutoCompleteCustomSource = col;
请注意,设计师允许您在不编写任何代码的情况下执行此操作...
答案 2 :(得分:2)
达到此结果:
您可以按照两种方式,第一种是环境属性选项卡,并设置以下属性:
最好的方法是通过代码创建此效果,请参阅以下示例:
AutoCompleteStringCollection sourceName = new AutoCompleteStringCollection();
foreach (string name in listNames)
{
sourceName.Add(name);
}
txtName.AutoCompleteCustomSource = sourceName;
txtName.AutoCompleteMode = AutoCompleteMode.Suggest;
txtName.AutoCompleteSource = AutoCompleteSource.CustomSource;
答案 3 :(得分:2)
private void TurnOnAutocomplete()
{
textBox.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
textBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
AutoCompleteStringCollection collection = new AutoCompleteStringCollection();
string[] arrayOfWowrds = new string[];
try
{
//Read in data Autocomplete list to a string[]
string[] arrayOfWowrds = new string[];
}
catch (Exception err)
{
MessageBox.Show(err.Message, "File Missing", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
collection.AddRange(arrayOFWords);
textBox.AutoCompleteCustomSource = collection;
}
您需要在获得自动填充列表所需的数据后再调用一次。绑定后,它将保留在textBox中。每次在textBox中更改文本时,您都不需要或想要调用它,这将会终止您的程序。
答案 4 :(得分:1)
当然这取决于你如何实现它,但也许这是一个好的开始:
using System.Windows.Forms;
public class AutoCompleteTextBox : TextBox {
private string[] database;//put here the strings of the candidates of autocomplete
private bool changingText = false;
protected override void OnTextChanged (EventArgs e) {
if(!changingText && database != null) {
//searching the first candidate
string typed = this.Text.Substring(0,this.SelectionStart);
string candidate = null;
for(int i = 0; i < database.Length; i++)
if(database[i].Substring(0,this.SelectionStart) == typed) {
candidate = database[i].Substring(this.SelectionStart,database[i].Length);
break;
}
if(candidate != null) {
changingText = true;
this.Text = typed+candidate;
this.SelectionStart = typed.Length;
this.SelectionLength = candidate.Length;
}
}
else if(changingText)
changingText = false;
base.OnTextChanged(e);
}
}
我不确定这是否运作良好,但我认为这段代码的基础已经足够了。
答案 5 :(得分:0)
您可以附加到KeyDown事件,然后在数据库中查询用户已输入的文本部分。例如,如果用户输入“T”,则搜索以“T”开头的内容。然后,当他们输入下一个字母,例如“e”时,搜索表格中以“Te”开头的内容。
例如,可用项目可以显示在“浮动”ListBox中。您需要将ListBox放在TextBox下面,以便他们可以看到可用的条目,然后在完成输入时删除ListBox。
答案 6 :(得分:0)
private void textBox1_TextChanged(object sender, EventArgs e)
{
try
{
textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
AutoCompleteStringCollection col = new AutoCompleteStringCollection();
con.Open();
sql = "select *from Table_Name;
cmd = new SqlCommand(sql, con);
SqlDataReader sdr = null;
sdr = cmd.ExecuteReader();
while (sdr.Read())
{
col.Add(sdr["Column_Name"].ToString());
}
sdr.Close();
textBox1.AutoCompleteCustomSource = col;
con.Close();
}
catch
{
}
}
答案 7 :(得分:0)
You can add a parameter in the query like @emailadd to be added in the aspx.cs file where the Stored Procedure is called with cmd.Parameter.AddWithValue.
The trick is that the @emailadd parameter doesn't exist in the table design of the select query, but being added and inserted in the table.
USE [DRDOULATINSTITUTE]
GO
/****** Object: StoredProcedure [dbo].[ReikiInsertRow] Script Date: 5/18/2016 11:12:33 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[ReikiInsertRow]
@Reiki varchar(100),
@emailadd varchar(50)
as
insert into dbo.ReikiPowerDisplay
select Reiki,ReikiDescription, @emailadd from ReikiPower
where Reiki=@Reiki;
Posted By: Aneel Goplani. CIS. 2002. USA