先上代码
DataClassesXDataContext db = new DataClassesXDataContext();
// 使用 let 关键字
DateTime dt = DateTime.Now;
var q1 = (from z in db.dtZone
let adCount = db.dtAD.Count(ad => ad.iZone == z.ID)
select new
{
z.ID,
adCount,
}).Take(10).ToList();
Response.Write((DateTime.Now - dt) + "<br />");
// 先 Select 后 Take
dt = DateTime.Now;
var q2 = (from z in db.dtZone
select new
{
z.ID,
adCount = db.dtAD.Count(ad => ad.iZone == z.ID),
}).Take(10).ToList();
Response.Write((DateTime.Now - dt) + "<br />");
// 先 Take 后 Select
dt = DateTime.Now;
var q3 = (from z in db.dtZone
select new { z.ID }).Take(10).ToList().Select(z => new
{
z.ID,
adCount = db.dtAD.Count(ad => ad.iZone == z.ID),
}).ToList();
Response.Write((DateTime.Now - dt) + "<br />");
在一个有 365 行记录的 dtZone 表和 5700 行记录的 dtAD 的数据库中进行嵌套查询(远程),同样取 10 条 dtZone 记录及对应的 dtAD 数,结果表明前两种执行时间相差无几,第二种略快,但第三种由于进行了多次查询,消耗的时间接近于前两种的 10 倍。结果仅供参考。
jQuery 请求代码:
$.ajax({ url: "xxxxxx", //method: "GET", // 默认 GET(当 dataType 为 jsonp 时此参数无效,始终以 GET 方式请求) data: $('#myForm').serialize(), // 要传递的参数,这里提交表单 myForm 的内容 dataType: "jsonp" //, jsonp: "callback" // 请求中的回调函数的参数名,默认值 callback //, jsonpCallback: "jQuery_abc" // 本地回调函数名,不指定则随机 }) .done(function () { alert("done"); if (true) { $('#myForm')[0].reset(); } }) .fail(function () { alert("fail"); }) .always(function () { alert("complete"); });
ASP.NET 处理代码:
JavaScriptSerializer jss = new JavaScriptSerializer(); string json = jss.Serialize(new { result = new { success = true, msg = "成功" } }); if (!string.IsNullOrWhiteSpace(Request["callback"]) && Regex.IsMatch(Request["callback"], @"[_$a-zA-Z][$\w]*")) { Response.ContentType = "application/javascript; charset=utf-8"; Response.Write(json + Request["callback"] + "(" + json + ")"); } else { Response.ContentType = "application/json; charset=utf-8"; Response.Write(json); } Response.End();
evasi0n 是由 pod2g、planetbeing、pimskeks、肌肉男四名黑客组成的 evad3rs 越狱梦之队发布的 iOS6 完美越狱工具。可以完美越狱 iOS6.0、iOS6.0.1、iOS6.0.2、iOS6.1、iOS6.1.1 和 iOS6.1.2 等多个固件版本的所有 iOS6 设备(AppleTV 除外)。
下载地址:http://evasi0n.com/
p:first-line 段落中的第一行文本
p:first-lette 段落中的第一个字母
p.view{color:green; font-size:12px}
p.view:first-line{color:yellow; font-size:12px}
p.view:first-letter{color:red; font-size:24px}
</STYLE>
<P class=view>中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国</P>
<P class=view>abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg</P>
效果:
中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国中华人民共和国
abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg
在母板页"CS"加入:
{
get
{
return HyperLink3;
}
set
{
HyperLink3 = value;
}
}
在子页"源"加入:
即可在子页重写它:
但最好放在Page_LoadComplete:
{
}
string chkCode = string.Empty;
//颜色列表,用于验证码、噪线、噪点
//Color[] color ={Color.White, Color.Yellow, Color.LightBlue, Color.LightGreen,
// Color.Orange, Color.LightCyan, Color.LightPink,
// Color.LightSalmon };
Color[] color = {Color.Black, Color.Blue, Color.Red, Color.DarkViolet,
Color.Chocolate, Color.DarkGreen, Color.DeepSkyBlue,
Color.DarkCyan };
//字体列表,用于验证码
string[] font = {"Times New Roman", "MS Mincho", "Book Antiqua", "Gungsuh",
"PMingLiU", "Impact" };
//验证码的字符集,去掉了一些容易混淆的字符
char[] character ={'2', '3', '4', '5', '6', '8', '9', 'A', 'B', 'C', 'D', 'E',
'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T',
'W', 'X', 'Y' };
Random rnd = new Random();
//生成验证码字符串
for (int i = 0; i < 4; i++)
{
chkCode += character[rnd.Next(character.Length)];
}
//把验证码存入session
Session["chkCode"] = chkCode;
Bitmap bmp = new Bitmap(65, 20);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.Transparent);//背景色
//画噪线
for (int i = 0; i < 0; i++)
{
int x1 = rnd.Next(65);
int y1 = rnd.Next(20);
int x2 = rnd.Next(65);
int y2 = rnd.Next(20);
Color clr = color[rnd.Next(color.Length)];
g.DrawLine(new Pen(clr), x1, y1, x2, y2);
}
//画验证码字符串
for (int i = 0; i < chkCode.Length; i++)
{
string fnt = font[rnd.Next(font.Length)];
Font ft = new Font(fnt, 15);
Color clr = color[rnd.Next(color.Length)];
g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr),
(float)i * 15 + 2, (float)0);
}
//画噪点
for (int i = 0; i < 50; i++)
{
int x = rnd.Next(bmp.Width);
int y = rnd.Next(bmp.Height);
Color clr = color[rnd.Next(color.Length)];
bmp.SetPixel(x, y, clr);
}
//清除该页输出缓存,设置该页无缓存
Response.Buffer = true;
Response.ExpiresAbsolute = System.DateTime.Now.AddMilliseconds(0);
Response.Expires = 0;
Response.CacheControl = "no-cache";
Response.AppendHeader("Pragma", "No-Cache");
//将验证码图片写入内存流,并将其以 "image/Png" 格式输出
MemoryStream ms = new MemoryStream();
try
{
bmp.Save(ms, ImageFormat.Png);
Response.ClearContent();
Response.ContentType = "image/Png";
Response.BinaryWrite(ms.ToArray());
}
finally
{
//显式释放资源
bmp.Dispose();
g.Dispose();
}
CatalogEdit.aspx
<asp:ListBox ID="ListBox1" runat="server" DataSourceID="SqlDataSource1" DataTextField="catalog" DataValueField="ID" Rows="10"></asp:ListBox> <asp:LinkButton ID="LinkButton_up" runat="server" OnClick="LinkButton_up_Click">上移</asp:LinkButton> <asp:LinkButton ID="LinkButton_down" runat="server" OnClick="LinkButton_down_Click">下移</asp:LinkButton> <asp:LinkButton ID="LinkButton_del" runat="server" OnClick="LinkButton_del_Click">删除</asp:LinkButton> <asp:Label ID="Label_alert" runat="server" ForeColor="Red" Text="Label"></asp:Label><br /> <asp:TextBox ID="TextBox_newCatalog" runat="server"></asp:TextBox> <asp:LinkButton ID="LinkButton_add" runat="server" OnClick="LinkButton_add_Click">新增</asp:LinkButton> <asp:LinkButton ID="LinkButton_edit" runat="server" OnClick="LinkButton_edit_Click">修改</asp:LinkButton> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionStringLink %>" DeleteCommand="DELETE FROM [xLinkCategory] WHERE [ID] = ?" InsertCommand="INSERT INTO [xLinkCategory] ([username],[catalog],[order]) VALUES (?,?,0)" ProviderName="<%$ ConnectionStrings:ConnectionStringLink.ProviderName %>" SelectCommand="SELECT [ID], [catalog] FROM [xLinkCategory] WHERE ([username] = ?) ORDER BY [order],[ID] desc" UpdateCommand="UPDATE [xLinkCategory] SET [catalog] = ? WHERE [ID] = ?"> <DeleteParameters> <asp:Parameter Name="ID" Type="Int32" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="catalog" Type="String" /> <asp:Parameter Name="ID" Type="Int32" /> </UpdateParameters> <SelectParameters> <asp:SessionParameter Name="username" SessionField="username" Type="String" /> </SelectParameters> <InsertParameters> <asp:SessionParameter Name="username" SessionField="username" Type="String" /> <asp:Parameter Name="catalog" Type="String" /> </InsertParameters> </asp:SqlDataSource>
CatalogEdit.aspx.cs
/**//// <summary> /// 上移 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButton_up_Click(object sender, EventArgs e) { if (ListBox1.SelectedItem != null && ListBox1.SelectedIndex > 0) { string tempValue = ListBox1.SelectedValue; string tempText = ListBox1.SelectedItem.Text; int index = ListBox1.SelectedIndex; ListBox1.SelectedItem.Value = ListBox1.Items[index - 1].Value; ListBox1.SelectedItem.Text = ListBox1.Items[index - 1].Text; ListBox1.Items[index - 1].Value = tempValue; ListBox1.Items[index - 1].Text = tempText; ListBox1.SelectedIndex--; operateDB_move(); } } /**//// <summary> /// 下移 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButton_down_Click(object sender, EventArgs e) { if (ListBox1.SelectedItem != null && ListBox1.SelectedIndex < ListBox1.Items.Count - 1) { string tempValue = ListBox1.SelectedValue; string tempText = ListBox1.SelectedItem.Text; int index = ListBox1.SelectedIndex; ListBox1.SelectedItem.Value = ListBox1.Items[index + 1].Value; ListBox1.SelectedItem.Text = ListBox1.Items[index + 1].Text; ListBox1.Items[index + 1].Value = tempValue; ListBox1.Items[index + 1].Text = tempText; ListBox1.SelectedIndex++; operateDB_move(); } } /**//// <summary> /// 添加 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButton_add_Click(object sender, EventArgs e) { if (TextBox_newCatalog.Text != "") { //检查同名 bool goon = true; foreach (ListItem li in ListBox1.Items) { if (li.Text == TextBox_newCatalog.Text) { goon = false; } } if (goon) { //操作 SqlDataSource1.InsertParameters["catalog"].DefaultValue = TextBox_newCatalog.Text; SqlDataSource1.Insert(); //设置selected if (ListBox1.Items.Count > 0) { ListBox1.SelectedIndex = 0; } } else { Label_alert.Text = "已存在"; } } } /**//// <summary> /// 修改 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButton_edit_Click(object sender, EventArgs e) { if (TextBox_newCatalog.Text != "" && ListBox1.SelectedItem != null) { int index = ListBox1.SelectedIndex; //检查同名 bool goon = true; foreach (ListItem li in ListBox1.Items) { if (li.Text == TextBox_newCatalog.Text) { goon = false; } } if (goon) { //操作 SqlDataSource1.UpdateParameters["catalog"].DefaultValue = TextBox_newCatalog.Text; SqlDataSource1.UpdateParameters["ID"].DefaultValue = ListBox1.SelectedItem.Value; SqlDataSource1.Update(); //设置selected ListBox1.SelectedIndex = index; } else { Label_alert.Text = "已存在"; } } } /**//// <summary> /// 删除 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButton_del_Click(object sender, EventArgs e) { if (ListBox1.SelectedItem != null) { int index = ListBox1.SelectedIndex; int count = ListBox1.Items.Count; //检查该 Catalog 下是否有 Link bool goon = true; goon = !checkSubLink(ListBox1.SelectedValue); //下有 Link 则返回真,注意前面有个"!",有则不继续 if (goon) { //操作 SqlDataSource1.DeleteParameters["ID"].DefaultValue = ListBox1.SelectedItem.Value; SqlDataSource1.Delete(); //设置selected if (index < count - 1) //删的不是最末项 { ListBox1.SelectedIndex = index; } if (index == count - 1 && index != 0) //删的是最末项,并且不是最首项 { ListBox1.SelectedIndex = index - 1; } if (index == count - 1 && index == 0) //删的是最末项,并且是最首项 { //不设索引 } } else { Label_alert.Text = "该节点下面存在Link(s),请删除后再删除该节点!"; } } }