ASP.NET 从 WebService 获取错误数据

Question

employees.aspx.cs 中的 getEditData 方法：

[System.Web.Services.WebMethod]
public static string getEditData(int id)
{
    Employe e = new Employe();
    try
    {
        using (SqlConnection openCon = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["MyDBConnection"].ConnectionString))
        {
            string saveStaff = "SELECT * FROM employes WHERE id=@id";

            using (SqlCommand querySaveStaff = new SqlCommand(saveStaff))
            {
                querySaveStaff.Connection = openCon;

                querySaveStaff.Parameters.Add("@id", SqlDbType.Int).Value = id;

                openCon.Open();

                using (SqlDataReader reader = querySaveStaff.ExecuteReader())
                {
                    // Check is the reader has any rows at all before starting to read.
                    if (reader.HasRows)
                    {
                        // Read advances to the next row.
                        while (reader.Read())
                        {
                            e.id = reader.GetInt32(reader.GetOrdinal("id"));
                            e.prenom = reader.GetString(reader.GetOrdinal("prenom"));
                            e.nom = reader.GetString(reader.GetOrdinal("nom"));
                            e.imei = reader.GetString(reader.GetOrdinal("phone_IMEI"));
                            e.sexe = reader.GetString(reader.GetOrdinal("sexe"));
                            e.tel = reader.GetString(reader.GetOrdinal("tel"));
                            e.comment = reader.GetString(reader.GetOrdinal("comment"));
                        }
                    }
                }
                openCon.Close();
            }
        }
    }
    catch (Exception ex) { }

    JavaScriptSerializer js = new JavaScriptSerializer();
    return js.Serialize(e);
}

函数JS/AJAX：

function openEdit(id) {
    $.ajax({
        type: "POST",
        url: "employes.aspx/getEditData",
        data: '{ id: ' + id + ' }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data) {
            var parsedData = JSON.parse(data.d);
            console.log(parsedData);
            $("#idEdit").val(parsedData.id);
            $("#prenomEdit").val(parsedData.prenom);
            $("#nomEdit").val(parsedData.nom);
            $("#imeiEdit").val(parsedData.imei);
            $("#sexeEdit").val(parsedData.sexe);
            $("#telEdit").val(parsedData.tel);
            $("#commentEdit").val(parsedData.comment);
        },
        error: function (data) { console.log("error"); }
    });

    $("#myModalEdit").modal('toggle');
}

console.log(parsedData)的结果；对于 4 行：

对象 { id: 39, prenom: "ayoub", nom: "laazazi", imei: "35blabla..227", sexe: "male", tel: "06blabla..4", comment: "meme" }

Object { id: 40, prenom: "admin", nom: "admin", imei: "744444", sexe: "male", tel: null, comment: null }

Object { id: 53, prenom: "lawl", nom: "k", imei: "555", sexe: "female", tel: null, comment: null }

Object { id: 54, prenom: "gfd235", nom: "sdfgh2", imei: null, sexe: null, tel: null, comment: null } //这里的问题sexe不应该是NULL，因为SQL服务器图像说。

我在模态选择中得到什么（PS：选择值是：男性和女性）：

2 examples of the Modals image

SQL Server 中的 [employe] 表：

SQL Server table image

openEdit(id) 按钮：

    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
    <asp:Timer ID="Timer1" runat="server" Interval="600000" ontick="Timer1_Tick"></asp:Timer>

    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:MyDBConnection %>" 
        SelectCommand="SELECT * FROM [employes]"></asp:SqlDataSource>

    <div id="info"></div>
    <!-- Data Display DIV -->
    <div id="viewdata" class="overflowTable">
        <asp:repeater id="Repeater1" datasourceid="SqlDataSource1" runat="server">
            <HeaderTemplate>
                <table class="table table-bordered table-hover table-colored results">
                    <thead>
                        <tr>
                        <th>Nom</th>
                        <th>Sexe</th>
                        <th>Code IMEI</th>
                        <th>Commentaire</th>
                        <th>Action</th>
                        </tr>
                    </thead>
                    <tbody id="myTbody">

            </HeaderTemplate>

            <ItemTemplate>
            <tr>
                <td onclick="selectRow(this)" class="restd"><%# generateName(Eval("prenom"), Eval("nom"))%></td>
                <td onclick="selectRow(this)" class="restd"><%# checkNull(Eval("sexe").ToString())%></td>
                <td onclick="selectRow(this)" class="restd"><%# checkNull(Eval("phone_IMEI").ToString()) %></td>
                <td onclick="selectRow(this)" class="restd"><%# checkNull(Eval("comment").ToString())%></td>
                <td>
                    <asp:LinkButton class="btn btn-success btn-sm" title="Modifier un client" onclick="openEdit(<%# Eval("id") %>)"><span class="glyphicon glyphicon-pencil" aria-hidden="true"></span></asp:LinkButton>
                    <!-- this is the button that opens the modal -->
                </td>
            </tr>
            </ItemTemplate>

            <FooterTemplate>
                </tbody>
                </table>
            </FooterTemplate>
        </asp:repeater>
    </div>
</ContentTemplate>
</asp:UpdatePanel> 

员工等级：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace BlablaWebService
{
    public class Employe
    {
        public int id { get; set; }
        public string prenom { get; set; }
        public string nom { get; set; }
        public string imei { get; set; }
        public string sexe { get; set; }
        public string tel { get; set; }
        public string comment { get; set; }

        public Employe() { }

        public Employe(int id, string prenom, string nom, string imei, string sexe, string tel, string comment)
        {
            this.id = id;
            this.prenom = prenom;
            this.nom = nom;
            this.imei = imei;
            this.sexe = sexe;
            this.tel = tel;
            this.comment = comment;
        }
    }
}

编辑

感谢 Pól O' Muilleoir，这是我最后的工作代码：

using (SqlDataReader reader = querySaveStaff.ExecuteReader())
{
    if (reader.Read())
    {
        e.id = reader.GetInt32(reader.GetOrdinal("id"));
        e.prenom = reader.IsDBNull(reader.GetOrdinal("prenom")) ? string.Empty : reader.GetString(reader.GetOrdinal("prenom"));
        e.nom = reader.IsDBNull(reader.GetOrdinal("nom")) ? string.Empty : reader.GetString(reader.GetOrdinal("nom"));
        e.imei = reader.IsDBNull(reader.GetOrdinal("phone_IMEI")) ? string.Empty : reader.GetString(reader.GetOrdinal("phone_IMEI"));
        e.sexe = reader.IsDBNull(reader.GetOrdinal("sexe")) ? string.Empty : reader.GetString(reader.GetOrdinal("sexe"));
        e.tel = reader.IsDBNull(reader.GetOrdinal("tel")) ? string.Empty : reader.GetString(reader.GetOrdinal("tel"));
        e.comment = reader.IsDBNull(reader.GetOrdinal("comment")) ? string.Empty : reader.GetString(reader.GetOrdinal("comment"));
    }
}

Answer 1

我认为问题在于 'sexe' 之前的 'imei' 的空值，这会导致阅读器失败。

替换

e.imei = reader.GetString(reader.GetOrdinal("phone_IMEI"));

与

int ordinal = reader.GetOrdinal('phone_IMEI');

    if(!reader.IsDbNull(ordinal))
    {
       e.imei = reader.GetString(ordinal);
    } 
    else
    {
       e.imei = string.Empty;
    }

有更好的方法来写这个，但试试看是否能解决它。您还必须对可能返回 null 的任何其他值执行此操作，请尝试为读取器对象编写扩展方法。

Answer 2

据我所知，您正试图获得“单一”记录。试试这个...

using (SqlDataReader reader = querySaveStaff.ExecuteReader())
            {
                if (reader.Read())
                    {
                        e.id = reader.GetInt32(reader.GetOrdinal("id"));
                        e.prenom = reader.GetString(reader.GetOrdinal("prenom"));
                        e.nom = reader.GetString(reader.GetOrdinal("nom"));
                        e.imei = reader.GetString(reader.GetOrdinal("phone_IMEI"));
                        e.sexe = reader.GetString(reader.GetOrdinal("sexe"));
                        e.tel = reader.GetString(reader.GetOrdinal("tel"));
                        e.comment = reader.GetString(reader.GetOrdinal("comment"));
                    }
                }

另外，在您的 AJAX 中，您可能需要将类型从“POST”更改为“GET”