我怎样才能让我的自动完成扩展工作？

问题描述

我试过的信来搜索我的code错误，但我不能让自己的自动完成扩展工作。把招工广告。

下面是我的code：（摘自我的aspx页面）

 ＆LT; ASP：文本框ID =TextBox1的WIDTH =120像素=服务器＆GT;＆LT; / ASP：文本框＆GT;
    ＆LT; CC1：AutoCompleteExtender ID =AutoCompleteExtender1=服务器的TargetControlID =TextBox1的ServiceMethod =GetCompletionListServicePath =SearchAutoComplete.asmx最低prefixLength =1＆GT;
    ＆LT; / CC1：AutoCompleteExtender＆GT;
 

我的web code：

  [的WebMethod]
    公共静态字符串[] GetCompletionList（字符串prefixText，诠释计数）
    {
        清单＆LT;串GT; returnData =新的List＆LT;串GT;（）;
        的MySqlConnection CON =新的MySqlConnection（Connection.ConnectionString（））;
        字符串SQL =选择博客的标题，其中标题LIKE'％+ prefixText +％';
        MySqlCommand的CMD =新的MySqlCommand（SQL，CON）;
        con.Open（）;
        MySqlDataReader将读卡器= cmd.ExecuteReader（CommandBehavior.CloseConnection）;
        而（reader.Read（））
        {
            returnData.Add（读卡器[标题]的ToString（））;
        }
        返回returnData.ToArray（）;
    }
 

解决方案

还有 GetCompletionList 方法被错误地宣布为静态，它需要有两个属性; [System.Web.Services.WebMethod] 和 [System.Web.Script.Services.ScriptMethod]

所以，你的声明应该是这样的：

  [System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
公共字符串[] GetCompletionList（字符串prefixText，诠释计数）{...
 

此外，您的服务类应具有以下属性：

  [WebService的空间（namespace =htt​​p://tempuri.org/）]
[WebServiceBinding（ConformsTo = WsiProfiles.BasicProfile1_1）
[System.ComponentModel.ToolboxItem（假）]
[System.Web.Script.Services.ScriptService]
 

自动完成扩展也将出现，如果你的 GetCompletionList 方法抛出一个异常被打破。为了防止这种情况，你应该添加周围的code功能的在try..catch 块

  [System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
公共字符串[] GetCompletionList（字符串prefixText，诠释计数）
{
    清单＆LT;串GT; returnData =新的List＆LT;串GT;（）;    尝试
    {
        //数据库访问code，设置returnData
    }
    赶上（异常前）
    {
        //记录异常
    }    返回returnData.ToArray（）;
}
 

I've tried to the letter to search for mistakes in my code, but i can't myself get that autocomplete extender to work. Help wanted.

Here's my code: (excerpt from my aspx page)

  <asp:TextBox ID="TextBox1" Width="120px" runat="server"></asp:TextBox>
    <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" TargetControlID="TextBox1" ServiceMethod="GetCompletionList" ServicePath="SearchAutoComplete.asmx" MinimumPrefixLength="1">
    </cc1:AutoCompleteExtender>

My Webservice code:

 [WebMethod]
    public static string[] GetCompletionList(string prefixText, int count)
    {
        List<string> returnData = new List<string>();
        MySqlConnection con = new MySqlConnection(Connection.ConnectionString());
        string sql = "select title from blog where title like '%" + prefixText + "%'";
        MySqlCommand cmd = new MySqlCommand(sql, con);
        con.Open();
        MySqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        while (reader.Read())
        {
            returnData.Add(reader["title"].ToString());
        }
        return returnData.ToArray();
    }

解决方案

As well as the GetCompletionList method being incorrectly declared as static, it needs to have two attributes; [System.Web.Services.WebMethod] and [System.Web.Script.Services.ScriptMethod]

So your declaration should look like this:

[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public string[] GetCompletionList(string prefixText, int count) { ...

Also your service class should have the following attributes:

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]

The autocomplete extender will also appear to be broken if your GetCompletionList method throws an exception. To guard against this you should add a try..catch block around the code the function

[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public string[] GetCompletionList(string prefixText, int count)
{
    List<string> returnData = new List<string>();

    try
    {
        // database access code that sets returnData
    }
    catch (Exception ex)
    {
        // log the exception
    }

    return returnData.ToArray();
}

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