LINQ to SQL之面向对象的添加、查询、更新和删除
2012-08-02 17:16
579 查看
http://www.prg-cn.com/article-4418-1.html
介绍
以Northwind为示例数据库,DLINQ(LINQ to SQL)之完全面向对象的添加操作、查询操作、更新操作和删除操作
示例
Sample.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile=
"Sample.aspx.cs"
Inherits="LINQ_DLINQ_Sample" Title="面向对象的添加、查 询、更新和删除" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<p>
分类名称 :<asp:TextBox ID="txtCategoryName" runat="server"></asp:TextBox>
分类 描述:<asp:TextBox ID="txtDescription" runat="server"></asp:TextBox>
<asp:Button ID="btnAdd" runat="server" Text="添加" OnClick="btnAdd_Click" />
</p>
<asp:GridView ID="gvCategory" runat="server" DataKeyNames="CategoryID"
OnSelectedIndexChanged="gvCategory_SelectedIndexChanged" OnRowDeleting="gvCategory_RowDeleting" OnRowCancelingEdit="gvCategory_RowCancelingEdit"
OnRowEditing="gvCategory_RowEditing" OnRowUpdating="gvCategory_RowUpdating">
<Columns>
<asp:CommandField ShowSelectButton="True" ShowEditButton="True"
ShowDeleteButton="True">
</asp:CommandField>
</Columns>
</asp:GridView>
<br />
<asp:DetailsView ID="dvProduct" runat="server" DataKeyNames="ProductID">
</asp:DetailsView>
</asp:Content>
复制代码
Sample.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using DAL;
public partial class LINQ_DLINQ_Sample : System.Web.UI.Page
{
// 实例化一个 NorthwindDataContext(DataContext)
NorthwindDataContext _ctx = new NorthwindDataContext();
protected void Page_Load (object sender, EventArgs e)
{
if (! Page.IsPostBack)
{
BindCategory();
}
}
private void BindCategory()
{
// NorthwindDataContext对象的Category属性就是 Category集合
var categories = _ctx.Categories;
gvCategory.DataSource = categories;
gvCategory.DataBind();
}
protected void btnAdd_Click(object sender, EventArgs e)
{
// 实 例化一个Category
Categories c = new Categories();
// 设置Category对象的相关属性
c.CategoryName = txtCategoryName.Text;
c.Description = txtDescription.Text;
// 使用NorthwindDataContext对 象的InsertOnSubmit()方法添加Category对象
_ctx.Categories.InsertOnSubmit(c);
// 生成并执行相 应的SQL命令
_ctx.SubmitChanges();
gvCategory.EditIndex = -1;
BindCategory();
}
protected void gvCategory_SelectedIndexChanged(object sender, EventArgs e)
{
// 使用查询语法获得 Product集合
var products = from p in _ctx.Products
where p.Categories.CategoryID == (int) gvCategory.SelectedValue
select p;
dvProduct.DataSource = products;
dvProduct.DataBind();
}
protected void gvCategory_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
// 使用Single查询操作符获取指定的Category对象
Categories category = _ctx.Categories.Single(c => c.CategoryID == (int)gvCategory.DataKeys[e.RowIndex].Value);
// 使用DeleteOnSubmit()方法删除NorthwindDataContext对象的 Category集合中的指定Category对象
_ctx.Categories.DeleteOnSubmit(category);
// 生成并 执行相应的SQL命令
_ctx.SubmitChanges();
gvCategory.EditIndex = -1;
BindCategory();
}
protected void gvCategory_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
// 使用查询语法和 Single查询操作符获取指定的Category对象
Categories category = (from c in _ctx.Categories
where c.CategoryID == (int)gvCategory.DataKeys[e.RowIndex].Value
select c).Single();
// 设置Category对象的相关属性
category.CategoryName = ((TextBox)gvCategory.Rows[e.RowIndex].Cells[2].
Controls[0]).Text;
category.Description = ((TextBox) gvCategory.Rows[e.RowIndex].Cells[3].Controls[0]).Text;
// 生成并执行相应的SQL命令
_ctx.SubmitChanges();
gvCategory.EditIndex = -1;
BindCategory ();
}
protected void gvCategory_RowEditing (object sender, GridViewEditEventArgs e)
{
gvCategory.EditIndex = e.NewEditIndex;
BindCategory();
}
protected void gvCategory_RowCancelingEdit (object sender, GridViewCancelEditEventArgs e)
{
gvCategory.EditIndex = -1;
BindCategory();
}
}
复制代码
介绍
以Northwind为示例数据库,DLINQ(LINQ to SQL)之完全面向对象的添加操作、查询操作、更新操作和删除操作
示例
Sample.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile=
"Sample.aspx.cs"
Inherits="LINQ_DLINQ_Sample" Title="面向对象的添加、查 询、更新和删除" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<p>
分类名称 :<asp:TextBox ID="txtCategoryName" runat="server"></asp:TextBox>
分类 描述:<asp:TextBox ID="txtDescription" runat="server"></asp:TextBox>
<asp:Button ID="btnAdd" runat="server" Text="添加" OnClick="btnAdd_Click" />
</p>
<asp:GridView ID="gvCategory" runat="server" DataKeyNames="CategoryID"
OnSelectedIndexChanged="gvCategory_SelectedIndexChanged" OnRowDeleting="gvCategory_RowDeleting" OnRowCancelingEdit="gvCategory_RowCancelingEdit"
OnRowEditing="gvCategory_RowEditing" OnRowUpdating="gvCategory_RowUpdating">
<Columns>
<asp:CommandField ShowSelectButton="True" ShowEditButton="True"
ShowDeleteButton="True">
</asp:CommandField>
</Columns>
</asp:GridView>
<br />
<asp:DetailsView ID="dvProduct" runat="server" DataKeyNames="ProductID">
</asp:DetailsView>
</asp:Content>
复制代码
Sample.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using DAL;
public partial class LINQ_DLINQ_Sample : System.Web.UI.Page
{
// 实例化一个 NorthwindDataContext(DataContext)
NorthwindDataContext _ctx = new NorthwindDataContext();
protected void Page_Load (object sender, EventArgs e)
{
if (! Page.IsPostBack)
{
BindCategory();
}
}
private void BindCategory()
{
// NorthwindDataContext对象的Category属性就是 Category集合
var categories = _ctx.Categories;
gvCategory.DataSource = categories;
gvCategory.DataBind();
}
protected void btnAdd_Click(object sender, EventArgs e)
{
// 实 例化一个Category
Categories c = new Categories();
// 设置Category对象的相关属性
c.CategoryName = txtCategoryName.Text;
c.Description = txtDescription.Text;
// 使用NorthwindDataContext对 象的InsertOnSubmit()方法添加Category对象
_ctx.Categories.InsertOnSubmit(c);
// 生成并执行相 应的SQL命令
_ctx.SubmitChanges();
gvCategory.EditIndex = -1;
BindCategory();
}
protected void gvCategory_SelectedIndexChanged(object sender, EventArgs e)
{
// 使用查询语法获得 Product集合
var products = from p in _ctx.Products
where p.Categories.CategoryID == (int) gvCategory.SelectedValue
select p;
dvProduct.DataSource = products;
dvProduct.DataBind();
}
protected void gvCategory_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
// 使用Single查询操作符获取指定的Category对象
Categories category = _ctx.Categories.Single(c => c.CategoryID == (int)gvCategory.DataKeys[e.RowIndex].Value);
// 使用DeleteOnSubmit()方法删除NorthwindDataContext对象的 Category集合中的指定Category对象
_ctx.Categories.DeleteOnSubmit(category);
// 生成并 执行相应的SQL命令
_ctx.SubmitChanges();
gvCategory.EditIndex = -1;
BindCategory();
}
protected void gvCategory_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
// 使用查询语法和 Single查询操作符获取指定的Category对象
Categories category = (from c in _ctx.Categories
where c.CategoryID == (int)gvCategory.DataKeys[e.RowIndex].Value
select c).Single();
// 设置Category对象的相关属性
category.CategoryName = ((TextBox)gvCategory.Rows[e.RowIndex].Cells[2].
Controls[0]).Text;
category.Description = ((TextBox) gvCategory.Rows[e.RowIndex].Cells[3].Controls[0]).Text;
// 生成并执行相应的SQL命令
_ctx.SubmitChanges();
gvCategory.EditIndex = -1;
BindCategory ();
}
protected void gvCategory_RowEditing (object sender, GridViewEditEventArgs e)
{
gvCategory.EditIndex = e.NewEditIndex;
BindCategory();
}
protected void gvCategory_RowCancelingEdit (object sender, GridViewCancelEditEventArgs e)
{
gvCategory.EditIndex = -1;
BindCategory();
}
}
复制代码
相关文章推荐
- 8、步步为营VS 2008 + .NET 3.5(8) - DLINQ(LINQ to SQL)之面向对象的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(8) - DLINQ(LINQ to SQL)之面向对象的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(8) - DLINQ(LINQ to SQL)之面向对象的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(8) - DLINQ(LINQ to SQL)之面向对象的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(8) - DLINQ(LINQ to SQL)之面向对象的添加、查询、更新和删除
- DLINQ(LINQ to SQL)之面向对象的添加、查询、更新和删除
- 9、步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- 10、步步为营VS 2008 + .NET 3.5(10) - DLINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- LINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(10) - DLINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(10) - DLINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(10) - DLINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除
- 步步为营VS 2008 + .NET 3.5(10) - DLINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除
- DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除
- DLINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除