WebFrom中的服务器控件有时需要自动提交到服务器处理数据,所以要把AutoPostBack属性设置为True 为了防止每次提交回来刷新页面导致数据重新绑定,所以页面加载事件里面要加 if (!IsPostBack)来判断
1.DropDownList:下拉列表控件 显示数据:
//指定数据源 DropDownList1.DataSource = context.Nation; DropDownList1.DataTextField = "Name"; DropDownList1.DataValueField = "Code"; //绑定 DropDownList1.DataBind();
取选中项的值: DropDownList1.SelectedValue.ToString();
设置哪一项被选中: DropDownList1.SelectedIndex = 2;
2.ListBox: 属性:selectionmode:选中模式 显示数据:
ListBox1.DataSource = context.Nation; ListBox1.DataTextField = "Name"; ListBox1.DataValueField = "Code"; ListBox1.DataBind();
取选中项的值: ListBox1.SelectedValue.ToString();
单选框:RadioButton
属性:GroupName:组名,如果要实现单选效果,每个单选按钮的组名必须一样 看一下该按钮是否选中:RadioButton1.Checked;
单选按钮列表:
RadioButtonList 属性:RepeatDirection:横向或纵向 绑定数据:
RadioButtonList1.DataSource = context.Nation; RadioButtonList1.DataTextField = "Name"; RadioButtonList1.DataValueField = "Code"; RadioButtonList1.DataBind();
取选中项的值: RadioButtonList1.SelectedValue.ToString();
设置哪一项被选中: RadioButtonList1.SelectedIndex = 2;
3.CheckBox:复选框,Checked属性:是否选中
看一下该按钮是否选中:checkbox1.Checked;
4.CheckBoxList:复选框列表
属性RepeatDirection:横向或纵向
显示数据: CheckBoxList1.DataSource = context.Nation;
CheckBoxList1.DataTextField = "Name"; CheckBoxList1.DataValueField = "Code"; CheckBoxList1.DataBind(); //取选中项的值: foreach (ListItem item in CheckBoxList1.Items) { if (item.Selected) { Label1.Text += item.Text; } }
设置哪项选中:
如果设置一项选中:SelectedIndex = 2;
如果设置多项选中:foreach()
5.RadioButton:单选按钮,属性GroupName组名,同一个组名下的单选按钮产生互斥效果
6.RadioButtonList:单选按钮列表: 显示数据:
RadioButtonList1.DataSource = context.Nation; RadioButtonList1.DataTextField = "Name"; RadioButtonList1.DataValueField = "Code"; RadioButtonList1.DataBind(); // 取选中项的值: RadioButtonList1.SelectedValue.ToString(); //设置选中项: RadioButtonList1.SelectedIndex = 2;
树状图TreeView控件:
TreeNode a = new TreeNode("aa"); //根节点 TreeView1.Nodes.Add(a); TreeNode b = new TreeNode("bb");//子节点 TreeNode c = new TreeNode("cc"); TreeNode d = new TreeNode("dd"); a.ChildNodes.Add(b); a.ChildNodes.Add(c); a.ChildNodes.Add(d);
筛选条件查询:
//方式一 //var query = context.House; //foreach (House data in query) //{ // ListItem item = new ListItem(); // item.Text = data.Area; // if (!CheckBoxList1.Items.Contains(item)) // { // CheckBoxList1.Items.Add(item); // } //} //方式二: List<string> list = context.House.Select(p=>p.Area).Distinct().ToList(); foreach (string text in list) { ListItem item = new ListItem(); item.Text = text; CheckBoxList1.Items.Add(item); } List<string> listR = context.House.Select(p => p.RentType).Distinct().ToList(); foreach (string text in listR) { ListItem item = new ListItem(); item.Text = text; CheckBoxList2.Items.Add(item); } List<string> listH = context.House.Select(p => p.HouseType).Distinct().ToList(); foreach (string text in listH) { ListItem item = new ListItem(); item.Text = text; CheckBoxList3.Items.Add(item); } } } protected void Button1_Click(object sender, EventArgs e) { Response.Redirect("Insert.aspx"); } protected void ckQuAll_CheckedChanged(object sender, EventArgs e) { foreach (ListItem item in CheckBoxList1.Items) { item.Selected = ckQuAll.Checked; } } protected void ckZuAll0_CheckedChanged(object sender, EventArgs e) { foreach (ListItem item in CheckBoxList2.Items) { item.Selected = ckZuAll0.Checked; } } protected void ckFangAll1_CheckedChanged(object sender, EventArgs e) { foreach (ListItem item in CheckBoxList3.Items) { item.Selected = ckFangAll1.Checked; } } protected void Button2_Click(object sender, EventArgs e) { TestDataContext context = new TestDataContext(); List<House> list = context.House.ToList(); ArrayList listArea = new ArrayList(); ArrayList listZu = new ArrayList(); ArrayList listHouse = new ArrayList(); //区域筛选 if (CheckBoxList1.SelectedIndex >= 0 && !ckQuAll.Checked) { foreach (ListItem item in CheckBoxList1.Items) { if (item.Selected) { listArea.Add(item.Text); } } list = list.Where(p=>listArea.Contains(p.Area)).ToList(); } //租赁类型筛选 if (CheckBoxList2.SelectedIndex >= 0 && !ckZuAll0.Checked) { foreach (ListItem item in CheckBoxList2.Items) { if (item.Selected) { listZu.Add(item.Text); } } list = list.Where(p => listZu.Contains(p.RentType)).ToList(); } //房屋类型筛选 if (CheckBoxList3.SelectedIndex >= 0 && !ckFangAll1.Checked) { foreach (ListItem item in CheckBoxList3.Items) { if (item.Selected) { listHouse.Add(item.Text); } } list = list.Where(p => listHouse.Contains(p.HouseType)).ToList(); }
1.Repeater:
网页里面嵌入C#代码用的是<% %>,嵌入php代码<?php ?>
绑定数据的四种方式:
1.直接绑定 <%#Eval("Code") %>
2.调用函数 <%#ShowSex()%>
3.显示外键关系列 <%#Eval("Nation1.Name") %>
4.格式化显示 <%#Eval("Birthday","{0:yyyy年MM月dd日}") %>
需要绑定数据后才能显示数据:
DataClassesDataContext context = new DataClassesDataContext();
Repeater1.DataSource = context.Car; Repeater1.DataBind();
<HeaderTemplate> 头模板
<ItemTemplate>像模板
<FooterTemplate>脚模板
<%#ShowSex()%>转换Sex为男女:
<%#ShowNation()%>,转换民族为字符:
转换日期: