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我想使用带有文本框的 AutoCompleteExtender 来自动完成来自 mysql 数据库的用户输入。

但是当我运行代码并输入垃圾时的问题应该调用 webservice 方法但是服务方法在这里什么都不返回的问题是我的代码所以请给我建议。

<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" />

    </div>
    <div>
        <asp:UpdatePanel id="UPSearch" runat="server">
            <ContentTemplate>
                <asp:Panel runat="server" style="position:absolute; top: 48px; left: 10px;">
                    <asp:TextBox ID="txtSearch" runat="server" 
                        style="position:absolute; top: 17px; left: 235px;"></asp:TextBox>
                    <cc1:AutoCompleteExtender ID="ACE_txtSearch" runat="server" TargetControlID="txtSearch" ServiceMethod= "GetByLastName" ServicePath="SearchService.asmx" MinimumPrefixLength="1" >
                    </cc1:AutoCompleteExtender>
                     <asp:RadioButton ID="rdoLastName" runat="server" 
                        style="position:absolute; top: 96px; left: 224px; width: 186px;" 
                        Text="Search By Last Name"/>

                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    </form>
</body>

网络服务

namespace Imam_Contacts
{

    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    [System.Web.Script.Services.ScriptService]

    public class SearchService : System.Web.Services.WebService
    {


        [WebMethod]
        public string[] GetByLastName(string prefixText)
        {
         int count = 10;
         string sql = "Select * from contact_info Where Last_Name like @prefixText";
         SqlDataAdapter da = new SqlDataAdapter(sql,"server=localhost;User Id=root;database=contacts;Persist Security Info=True");
         da.SelectCommand.Parameters.Add("@prefixText", SqlDbType.VarChar, 50).Value = prefixText+ "%"; 
         DataTable dt = new DataTable(); 
         da.Fill(dt); 

         string[] items = new string[dt.Rows.Count];
         int i = 0; 
         foreach (DataRow dr in dt.Rows) 
         {
             items.SetValue(dr["Last_Name"].ToString(), i); 
             i++; 
         } 
         return items; 
        }
    }
}
4

2 回答 2

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尝试将“ScriptMethod”属性添加到“GetByLastName”方法中。此外，我认为自动完成功能期望服务方法具有第二个参数或类型 int，我认为它代表该方法应返回的最大结果数。

更新后的代码可能如下所示：

namespace Imam_Contacts
{

    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    [System.Web.Script.Services.ScriptService]
    public class SearchService : System.Web.Services.WebService
    {
        [System.Web.Script.Services.ScriptMethod]
        [WebMethod]
        public string[] GetByLastName(string prefixText, int count)
        {
         int count = 10;
         string sql = "Select * from contact_info Where Last_Name like @prefixText";
         SqlDataAdapter da = new SqlDataAdapter(sql,"server=localhost;User Id=root;database=contacts;Persist Security Info=True");
         da.SelectCommand.Parameters.Add("@prefixText", SqlDbType.VarChar, 50).Value = prefixText+ "%"; 
         DataTable dt = new DataTable(); 
         da.Fill(dt); 

         string[] items = new string[dt.Rows.Count];
         int i = 0; 
         foreach (DataRow dr in dt.Rows) 
         {
             items.SetValue(dr["Last_Name"].ToString(), i); 
             i++; 
         } 
         return items; 
        }
    }
}
于 2010-02-16T03:28:28.320 回答
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仅当您找不到更好的解决方案时，此答案才有意义，但我强烈建议您使用 jQuery 和它提供的众多自动完成插件之一。它更可靠，更可定制。

于 2010-02-15T21:44:50.593 回答