对象数据源找不到在使用更新和删除时具有参数的非泛型方法
本文关键字:参数 泛型方法 删除 找不到 数据源 更新 对象 | 更新日期: 2023-09-27 18:32:46
嗨,我收到此错误:
"对象数据源'对象数据源 1' 找不到非泛型 具有参数的方法"UpdateEmployee":originalEmployeeId, 原始名称, 原始性别, 原始城市, 员工 ID, 姓名, 性别, 城市。
当我按下更新按钮时。但是我的删除按钮没有问题。这是我的代码:
网络表单1.aspx
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataSourceID="ObjectDataSource1" DataKeyNames="EmployeeId">
<Columns>
<asp:CommandField ShowEditButton="True" ShowDeleteButton="True" />
<asp:BoundField DataField="EmployeeId" HeaderText="EmployeeId"
SortExpression="EmployeeId" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Gender" HeaderText="Gender"
SortExpression="Gender" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
</Columns>
</asp:GridView>
<br />
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
SelectMethod="GetAllEmployee2S" TypeName="EditingData.Employee2"
UpdateMethod="UpdateEmployee" DeleteMethod="DeleteEmployee" ConflictDetection="CompareAllValues" OldValuesParameterFormatString="original{0}">
<DeleteParameters>
<asp:Parameter Name="originalEmployeeId" Type="Int32" />
<asp:Parameter Name="originalName" Type="String" />
<asp:Parameter Name="originalGender" Type="String" />
<asp:Parameter Name="originalCity" Type="String" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="originalEmployeeId" Type="Int32" />
<asp:Parameter Name="originalName" Type="String" />
<asp:Parameter Name="originalGender" Type="String" />
<asp:Parameter Name="originalCity" Type="String" />
</UpdateParameters>
</asp:ObjectDataSource>
</div>
</form>
员工2.cs
public static List<Employee2> GetAllEmployee2S()
{
var dal = new Employee2Dal();
return dal.GetAllEmployee2S();
}
public static void DeleteEmployee(int originalEmployeeId, string originalName, string originalGender, string originalCity)
{
var dal = new Employee2Dal();
dal.DeleteEmployee(originalEmployeeId, originalName, originalGender, originalCity);
}
public static void UpdateEmployee(int originalEmployeeId, string originalName, string originalGender, string originalCity)
{
var dal = new Employee2Dal();
dal.UpdateEmployee(originalEmployeeId, originalName, originalGender, originalCity);
}
员工2达尔.cs
public void DeleteEmployee(int originalEmployeeId, string originalName, string originalGender, string originalCity)
{
var cs = ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString;
using (var con = new SqlConnection(cs))
{
const string deleteQuery = "Delete from Employee2 where EmployeeId=@OriginalEmployeeId and Name = @OriginalName and Gender = @OriginalGender and " +
"City = @OriginalCity";
var cmd = new SqlCommand(deleteQuery, con);
cmd.Parameters.AddWithValue("@OriginalEmployeeId", originalEmployeeId);
cmd.Parameters.AddWithValue("@OriginalName", originalName);
cmd.Parameters.AddWithValue("@OriginalGender", originalGender);
cmd.Parameters.AddWithValue("@OriginalCity", originalCity);
con.Open();
cmd.ExecuteNonQuery();
}
}
public void UpdateEmployee(int employeeId, string name, string gender, string city)
{
var cs = ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString;
using (var con = new SqlConnection(cs))
{
const string updateQuery = "Update Employee2 set Name=@Name, Gender=@Gender, City=@City where EmployeeId=@EmployeeId";
var cmd = new SqlCommand(updateQuery, con);
cmd.Parameters.AddWithValue("@EmployeeId", employeeId);
cmd.Parameters.AddWithValue("@Name", name);
cmd.Parameters.AddWithValue("@Gender", gender);
cmd.Parameters.AddWithValue("@City", city);
con.Open();
cmd.ExecuteNonQuery();
}
}
您的代码可以正常工作,因为Delete
方法不需要参数的当前值。因此,您只有旧值参数,这些参数的格式设置为orignial{0}'. But with
更新method you have both old and current values. Old values are also formatted with
原始{0}"前缀,但当前值使用未修改的 GridView 字段名称传递。所以你总共有 8 个参数:
originalEmployeeId, originalName, originalGender, originalCity
employeeId, name, gender, city
您可以简单地将缺少的参数添加到 UpdateEmployee 方法。但我认为你在这里不需要原始值。甚至更多 - 除了员工 ID 之外,您不需要任何 DeleteEmployee 方法的值。所以干脆不要使用原始值(请注意,ConflictDetection
应该等于OverwriteChanges,以便关闭传递给Update方法的原始值):
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
TypeName="EditingData.Employee2"
SelectMethod="GetAllEmployee2S"
UpdateMethod="UpdateEmployee"
DeleteMethod="DeleteEmployee" ConflictDetection="OverwriteChanges">
</asp:ObjectDataSource>
并让 GridView 传递与字段名称对应的参数
public static void DeleteEmployee(int employeeId)
{
var dal = new Employee2Dal();
dal.DeleteEmployee(employeeId); // modify dal method
}
public static void UpdateEmployee(int employeeId, string name, string gender, string city)
{
var dal = new Employee2Dal();
dal.UpdateEmployee(employeeId, name, gender, city);
}