标签：pre 模糊 lis student 分页 .text ice 最小值 val
Linq高级查询
以~开头:
r=>r.Name.StartsWith("李");
以~结尾:
r=>r.Name.EndsWith("光");
包含(模糊查询):
r=>r.Name.Contains("四");
数据总个数:
Con.Goods.Count();||Con.Users.ToList().count;
最大值:
Con.Goods.ToList().Max(r=>r.Price);
最小值:
Con.Goods.ToList().Min(r=>r.Price);
平均值:
Con.Goods.ToList().Average(r=>r.Price);
求和:
Con.Goods.ToList().Sum(r=>r.Price);
升序:
Con.Goods.ToList().OrderBy(r=>r.Price);
降序:
Con.Goods.ToList().OrderByDescending(r=>r.Price);
////////////////////////////////////////////////////////
组合查询:
<div>姓名:<asp:TextBox ID="T1" runat="server"></asp:TextBox></div> <div> 性别:<asp:DropDownList ID="DropDownList1" runat="server"> <asp:ListItem Text="男和女" Value="Null"></asp:ListItem> <asp:ListItem Text="男" Value="True"></asp:ListItem> <asp:ListItem Text="女" Value="False"></asp:ListItem> </asp:DropDownList> </div> <div> 成绩:<asp:DropDownList ID="DropDownList2" runat="server"> <asp:ListItem Text="不限" Value="Null"></asp:ListItem> <asp:ListItem Text="大于" Value=">"></asp:ListItem> <asp:ListItem Text="小于" Value="<"></asp:ListItem> </asp:DropDownList><asp:TextBox ID="T2" runat="server"></asp:TextBox> </div> <asp:Button ID="Button2" runat="server" Text="查询" />
void Button2_Click(object sender, EventArgs e) { using (StudentsDataClassesDataContext con = new StudentsDataClassesDataContext()) { List<Stu> s = con.Stu.ToList(); if (T1.Text.Trim().Length > 0) { s = s.Where(r => r.Name.Contains(T1.Text.Trim())).ToList(); } if (DropDownList1.SelectedValue != "Null") { s = s.Where(r => r.Sex == Convert.ToBoolean(DropDownList1.SelectedValue)).ToList();} if (DropDownList2.SelectedValue != "Null") { if (DropDownList2.SelectedValue == ">") { s = s.Where(r => r.Score > Convert.ToInt32((T2.Text.Trim()))).ToList(); } else { s = s.Where(r => r.Score < Convert.ToInt32((T2.Text.Trim()))).ToList(); } } Repeater1.DataSource = s; Repeater1.DataBind(); } }
组合查询+分页查询:
标签：pre 模糊 lis student 分页 .text ice 最小值 val
原文地址：http://www.cnblogs.com/zhangxin4477/p/6935517.html
