GridView常规用法
1、gridview前台界面代码
gridview创建列最主要的有两种方式:
1)数据绑定,表示数据绑定控件中作为文本显示的字段。DataField ="AnswerNum",AnswerNum是数据源中的一个字段。举例说明:
2)使用模板创建,举例说明:
ItemStyle是其模板样式,根据具体要求做出调整。
2、绑定数据源
代码如下 |
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this.gvQuestions.DataSource = ExamQuestionInfoList;
this.gvQuestions.DataBind();
this.gvQuestions.PageIndex = 0;
gvQuestions为GridView控件,ExamQuestionInfoList为数据源,gridview的数据源可以是DataTable或者是数据集DataSet。
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3、停留在某一行变色
代码如下 |
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private void ChangeColor(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#E6F5FA'");
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
}
}
protected void gvQuestions_RowDataBound(object sender, GridViewRowEventArgs e)
{
ChangeColor(sender, e);
}
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4、操作某一行
直接举例说明
代码如下 |
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protected void gvSubjectiveOption_RowCommand(object sender, GridViewCommandEventArgs e)
{
int rowSelected = Convert.ToInt32(e.CommandArgument);
questionOptionInfo = QuestionOptionBLL.GetModel(rowSelected);
//查看
if (e.CommandName == "ViewSOption")
{
this.tbOptionStem.Text = questionOptionInfo.QO_Option;
this.tbCorrectAnswer.Text = questionOptionInfo.QO_SubjectAnswer;//主观题答案
this.tbCorrectAnswerExplain.Text = questionOptionInfo.QO_Explain;
//选项附件
string optionAccessoryStr = questionOptionInfo.QO_Accessory;
string[] optionAccessoryArr = optionAccessoryStr.Split(',');
for (int i = 0; i < optionAccessoryArr.Length; i++)
{
OptionAccessoryList.Add(optionAccessoryArr[i]);
}
BindOptionAccessoryList();
}
if (e.CommandName == "DeleteOption")
{
QuestionOptionBLL.Delete(rowSelected);
int EQ_ID = questionOptionInfo.EQ_ID;
BindSubjectiveOption(EQ_ID);//重新绑定主观题问题信息
}
}
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e.CommandName对应前台界面的一些字段:
其中CommandName ="DeleteOption" CommandArgument ='<%# Bind("QO_ID") %>代表数据集中的某个字段。
5、添加Checkbox并且初始化台界面:
代码如下 |
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selectCorrectAnswer" CommandArgument ='<%# Bind("QO_ID") %>'>
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后台逻辑:
代码如下 |
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///
/// 初始化checkbox值
///
/// gridview控件
/// 数据源
/// checkbox控件名称
/// checkbox的值
private void InitializeCheckBox(GridView gv, DataTable dtSource, string cbName, string cbValue)
{
int count = dtSource.Rows.Count;
if (count > 0)
{
for (int i = 0; i < count; i++)
{
CheckBox cb = gv.Rows[i].FindControl(cbName) as CheckBox;
if (cb != null)
{
if (dtSource.Rows[i][cbValue].ToString() == "0")
{
cb.Checked = false;
}
else
{
cb.Checked = true;
}
}
}
}
}
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DropDownList常规用法:
1、DropDownList绑定简单数据源
此处暂且写一个简单的数据源,只是为了说明效果。
代码如下 |
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private void BindDropDownUp()
{
ArrayList al = new ArrayList();
al.Add("11");
al.Add("22");
al.Add("33");
this.DropDownList1.DataSource = al;
this.DropDownList1.DataBind();
}
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获取DropDownList中选择的值:string text = this.DropDownList1.SelectedItem.Text;
2、DropDownList绑定较为复杂数据源
此处从数据库中提取一个数据集ds,DropDownList控件的text框中显示一个值,选中后在后台可以获取绑定的value。具体如下:
代码如下 |
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private void BindDropDownUp()
{
string strSql = "select * from [OSCE].[dbo].[QuestionType]";
DataSet ds = Query(strSql);
this.DropDownList1.DataSource = ds;
this.DropDownList1.DataTextField = "QT_Name";
this.DropDownList1.DataValueField = "QT_ID";
this.DropDownList1.DataBind();//将数据 www.111com.net 源绑定到类似( GridView) 控件
}
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获取DropDownList控件text框的值:string text = this.DropDownList1.SelectedItem.Text;
获取DropDownList控件绑定的value值:string text2 = this.DropDownList1.SelectedValue;
3、在页面初始化时直接给DropDownList赋值
题外话:这个功能用的非常多,实现也很简单,但前提是你必须知道。找了好久才发现的。
代码如下 |
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ListItem li = DropDownList1.Items.FindByText("外科");//外科是想显现的值,前提是DataTextField中必须有
if (li != null)
{
int index = DropDownList1.Items.IndexOf(li);
DropDownList1.SelectedIndex = index;
}
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一个简单的例子说明GridView与DropDownList结合的用法。
代码如下 |
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ForeColor="#333333" GridLines="None" AllowSorting="True" PageSize="6">
DataValueField="User_Sex" DataTextField="User_Sex">
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
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;
public partial class GridView_DropDownList : System.Web.UI.Page
{
SqlConnection sqlcon;
string strCon = "Data Source=.SQL2005;DataBase=Users;Uid=sa;Pwd=123";
protected void Page_Load(object sender, EventArgs e)
{
//DataTextFiled 获取或设置为列表项提供文本内容的数据源字段
//DataValueField获取或设置为各列表项提供值的数据源字段
if (!IsPostBack)
{
DropDownList ddl;
string sqlstr = "SELECT * FROM Users";
sqlcon = new SqlConnection(strCon);
SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
DataSet myds = new DataSet();
sqlcon.Open();
myda.Fill(myds, "AlLUser");
GridView1.DataSource = myds;
GridView1.DataBind();
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
{
DataRowView mydrv = myds.Tables["ALLUser"].DefaultView[i];
if (Convert.ToString(mydrv["User_Sex"]).Trim() == "男")
{
ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");
ddl.SelectedIndex = 0;
ddl.SelectedItem.Text = "男";
}
else if (Convert.ToString(mydrv["User_Sex"]).Trim() == "女")
{
ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");
ddl.SelectedIndex = 1;
ddl.SelectedItem .Text = "女";
}
}
sqlcon.Close();
}
}
public SqlDataReader ddlBind()
{
string sqlstr = "SELECT DISTINCT User_Sex FROM Users";
sqlcon = new SqlConnection(strCon);
SqlCommand sqlcom = new SqlCommand(sqlstr, sqlcon);
sqlcon.Open();
return sqlcom.ExecuteReader();
}
}
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数据库:SQl2000 Northwind
效果如下