利用拼接字符串的方式来写一个简化版的后台网站（推荐初学者进）

今天用一般处理程序ashx做一个如下的效果，



主要是为了实现功能，界面丑就丑把。

先是显示界面DomeHandler.ashx

public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/html";

StringBuilder sb = new StringBuilder();
//连接字符串
string str = System.Configuration.ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
string sql = "select top(10) ProductID, ProductName, PTID, ProductJP, ProductPrice from Products";
using (SqlConnection conn=new SqlConnection(str))
{
using (SqlCommand cmd=new SqlCommand(sql,conn))
{
conn.Open();
using (SqlDataReader reader= cmd.ExecuteReader())
{
while (reader.Read())
{
sb.AppendFormat("<tr><td>{0}</td><td>{1}</td><td><a href='ShowDetail.ashx?id={0}'>详情</a><td/><td><a href='DeleteData.ashx?id={0}' onClick='return confirm(\"是否要删除\")'>删除</a><td/><td><a href='Edit.ashx?id={0}'>修改</a><td/></tr>", reader["ProductID"], reader["ProductName"]);
}
}
}
}

//将虚拟路径转化成绝对路径
string path=context.Request.MapPath("/ListHandler.html");
string html=System.IO.File.ReadAllText(path);
html=html.Replace("@changeStr", sb.ToString());

context.Response.Write(html);

}
其中的ListHandler.html是一个模板，也就是一个html页面
用占位符将需要替换的字符放在页面中，再用Replace替换数据即可

然后是详情页面ShowDetail.ashx

public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/html";
//获取传过来的参数
string id = context.Request.QueryString["id"];
int sqlId = int.Parse(id);

string str=System.Configuration.ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
string sql="select ProductID, ProductName, PTID, ProductJP, ProductPrice from Products where ProductID=@id";

//可变字符串
StringBuilder sb = new StringBuilder();

System.Data.DataTable dt = new System.Data.DataTable();
using (SqlDataAdapter adapter=new SqlDataAdapter(sql,str))
{
adapter.SelectCommand.Parameters.Add("@id", sqlId);
adapter.Fill(dt);
}

sb.AppendFormat("<td>{0}</td>", dt.Rows[0]["ProductID"]);
sb.AppendFormat("<td>{0}</td>", dt.Rows[0]["ProductName"]);
sb.AppendFormat("<td>{0}</td>", dt.Rows[0]["ProductJP"]);
sb.AppendFormat("<td>{0}</td>", dt.Rows[0]["ProductPrice"]);

//获取另一个页面的内容
string path=context.Request.MapPath("/ShowDataDetail.html");
string html = File.ReadAllText(path);
html = html.Replace("@changeStr", sb.ToString());
context.Response.Write(html);
}

然后是删除页面DeleteData.ashx

public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/html";

//获取ID
string id = context.Request.QueryString["id"];
int sqlId;
int.TryParse(id, out sqlId);
string sql = "delete from Products where ProductID=@id";
string str = System.Configuration.ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
if (sqlId==null)
{
return;
}
using (SqlConnection conn = new SqlConnection(str))
{
using (SqlCommand cmd=new SqlCommand(sql,conn))
{
cmd.Parameters.Add("@id", sqlId);
conn.Open();
int rows = cmd.ExecuteNonQuery();
if (rows > 0)
{
context.Response.Redirect("DomeHandler.ashx");
}
else
{
context.Response.Write("删除失败");
}
}
}

}

最后稍难的修改页面Edit.ashx

public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/html";

//获取是展示还是提交
if (context.Request["edit"] == "edit")
{
string id = context.Request["id"];
string productName = context.Request["ProductName"];
string productPrice = context.Request["ProductPrice"];
int sqlId;
int.TryParse(id, out sqlId);
if (sqlId == null)
{
return;
}

string sql = "update Products set ProductName=@ProductName,ProductPrice=@ProductPrice where ProductID=@id";
string str = System.Configuration.ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
using (SqlConnection conn = new SqlConnection(str))
{
using (SqlCommand cmd = new SqlCommand(sql, conn))
{
cmd.Parameters.Add("@id", sqlId);
cmd.Parameters.Add("@ProductName", productName);
cmd.Parameters.Add("@ProductPrice", productPrice);
conn.Open();
int rows = cmd.ExecuteNonQuery();
if (rows > 0)
{
//跳转页面到展示界面

4000
context.Response.Redirect("DomeHandler.ashx");
}
else
{
context.Response.Write("修改失败");
}
}
}
}
else
{
//获取ID
string id = context.Request.QueryString["id"];
int sqlId;
int.TryParse(id, out sqlId);
string sql = "select ProductID, ProductName, ProductPrice from Products where ProductID=@id";
string str = System.Configuration.ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
System.Data.DataTable dt = new System.Data.DataTable();

if (sqlId == null)
{
return;
}
using (SqlDataAdapter adapter = new SqlDataAdapter(sql, str))
{
adapter.SelectCommand.Parameters.Add("@id", sqlId);
adapter.Fill(dt);
}

string html=System.IO.File.ReadAllText(context.Request.MapPath("Edit.html"));
html = html.Replace("@id", dt.Rows[0]["ProductID"].ToString());
html = html.Replace("@ProductName", dt.Rows[0]["ProductName"].ToString());
html = html.Replace("@ProductPrice", dt.Rows[0]["ProductPrice"].ToString());

context.Response.Write(html);
}
}


再发一下Edit.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>

//一提交就交付给Edit.ashx?edit=edit来处理
 <form method="post" action="Edit.ashx?edit=edit">
//隐藏字段，只用来自己用的
 <input type="hidden" name="id" value="@id" />
<table>
<tr>
<td>ProductName:
<input type="text" name="ProductName" value="@ProductName" />
</td>
</tr>
<tr>
<td>ProductPrice:
<input type="text" name="ProductPrice" value="@ProductPrice" />
</td>
</tr>
<tr>
<td>ProductName:
<input type="submit" name="sub" value="提交" />
</td>
</tr>
</table>
</form>
</body>
</html>


其实这种方法大同小异，只要掌握了拼接跳转的技巧，就可以自己写着玩了。
其中涉及了一些数据库的读取，就不详细说了。