Gridview1绑定了ObjectDataSource的默认方法getdata
我想当点击一个按钮时，根据tb_username这个输入框里边的用户名，筛选用户，在XSD中已经包括这个方法，如图：现在当我点击时，会提示这样的错误：
ObjectDataSource“ObjectDataSource1”未能找到带参数的非泛型方法“GetDataByName”: 。
点击按钮的代码如下：
ObjectDataSource1.SelectParameters.Clear();
ObjectDataSource1.SelectMethod = "GetDataByName";
ObjectDataSource1.DataBind(); Parameter par1 = new Parameter();
par1.Type = TypeCode.Char;
par1.DefaultValue = this.TB_username.Text.Trim();
this.ObjectDataSource1.SelectParameters.Add(par1);
ObjectDataSource1.Select();
请问我哪里错了呢，急救！！
我想当点击一个按钮时，根据tb_username这个输入框里边的用户名，筛选用户，在XSD中已经包括这个方法，如图：现在当我点击时，会提示这样的错误：
ObjectDataSource“ObjectDataSource1”未能找到带参数的非泛型方法“GetDataByName”: 。
点击按钮的代码如下：
ObjectDataSource1.SelectParameters.Clear();
ObjectDataSource1.SelectMethod = "GetDataByName";
ObjectDataSource1.DataBind(); Parameter par1 = new Parameter();
par1.Type = TypeCode.Char;
par1.DefaultValue = this.TB_username.Text.Trim();
this.ObjectDataSource1.SelectParameters.Add(par1);
ObjectDataSource1.Select();
请问我哪里错了呢，急救！！
aspx:<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS" Assembly="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>ObjectDataSource - C# Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server"> <asp:gridview
id="GridView1"
runat="server"
datasourceid="ObjectDataSource1" /> <asp:objectdatasource
id="ObjectDataSource1"
runat="server"
selectmethod="GetAllEmployees"
typename="Samples.AspNet.CS.EmployeeLogic" /> </form>
</body>
</html>代码:namespace Samples.AspNet.CS {using System;
using System.Collections;
using System.Collections.Specialized;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI;
using System.Web.UI.WebControls;
//
// EmployeeLogic is a stateless business object that encapsulates
// the operations one can perform on a NorthwindEmployee object.
//
public class EmployeeLogic { // Returns a collection of NorthwindEmployee objects.
public static ICollection GetAllEmployees () {
ArrayList al = new ArrayList(); ConnectionStringSettings cts = ConfigurationManager.ConnectionStrings["NorthwindConnection"]; SqlDataSource sds
= new SqlDataSource(cts.ConnectionString, "SELECT EmployeeID FROM Employees"); try { IEnumerable IDs = sds.Select(DataSourceSelectArguments.Empty); // Iterate through the Enumeration and create a
// NorthwindEmployee object for each ID.
foreach (DataRowView row in IDs) {
string id = row["EmployeeID"].ToString();
NorthwindEmployee nwe = new NorthwindEmployee(id);
// Add the NorthwindEmployee object to the collection.
al.Add(nwe);
}
}
finally {
// If anything strange happens, clean up.
sds.Dispose();
} return al;
}
public static NorthwindEmployee GetEmployee(object anID) {
return new NorthwindEmployee(anID);
} public static void UpdateEmployeeInfo(NorthwindEmployee ne) {
bool retval = ne.Save();
if (! retval) { throw new NorthwindDataException("UpdateEmployee failed."); }
} public static void DeleteEmployee(NorthwindEmployee ne) { } } public class NorthwindEmployee { public NorthwindEmployee () {
ID = DBNull.Value;
lastName = "";
firstName = "";
title="";
titleOfCourtesy = "";
reportsTo = -1;
} public NorthwindEmployee (object anID) {
this.ID = anID; ConnectionStringSettings cts = ConfigurationManager.ConnectionStrings["NorthwindConnection"]; SqlConnection conn = new SqlConnection (cts.ConnectionString);
SqlCommand sc =
new SqlCommand(" SELECT FirstName,LastName,Title,TitleOfCourtesy,ReportsTo " +
" FROM Employees " +
" WHERE EmployeeID = @empId",
conn);
// Add the employee ID parameter and set its value.
sc.Parameters.Add(new SqlParameter("@empId",SqlDbType.Int)).Value = Int32.Parse(anID.ToString());
SqlDataReader sdr = null; try {
conn.Open();
sdr = sc.ExecuteReader(); // This is not a while loop. It only loops once.
if (sdr != null && sdr.Read()) {
// The IEnumerable contains DataRowView objects.
this.firstName = sdr["FirstName"].ToString();
this.lastName = sdr["LastName"].ToString();
this.title = sdr["Title"].ToString();
this.titleOfCourtesy = sdr["TitleOfCourtesy"].ToString();
if (! sdr.IsDBNull(4)) {
this.reportsTo = sdr.GetInt32(4);
}
}
else {
throw new NorthwindDataException("Data not loaded for employee id.");
}
}
finally {
try {
if (sdr != null) sdr.Close();
conn.Close();
}
catch (SqlException) {
// Log an event in the Application Event Log.
throw;
}
}
} private object ID; private string lastName;
public string LastName {
get { return lastName; }
set { lastName = value; }
} private string firstName;
public string FirstName {
get { return firstName; }
set { firstName = value; }
} private string title;
public String Title {
get { return title; }
set { title = value; }
} private string titleOfCourtesy;
public string Courtesy {
get { return titleOfCourtesy; }
set { titleOfCourtesy = value; }
} private int reportsTo;
public int Supervisor {
get { return reportsTo; }
set { reportsTo = value; }
} public bool Save () {
return true;
}
} internal class NorthwindDataException: Exception {
public NorthwindDataException(string msg) : base (msg) { }
}
}
已经在XSD中定义过了呀。
哥们，你给的代码对我这种情况好像用处不大。
改成
OldValuesParameterFormatString="{0}"
<asp:Parameter Name="CategoryName" Type="String" />参数名：CategoryName 好像也要跟
Gridview1 的DataField="CategoryName"一样