ASP.NET中的GridView自带的编辑更新功能

Posted 2020-07-08 讲义大魔王

string ConStr = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
GridView1.AllowSorting = true;
BindData();
SetGrid();
//ViewState["style"] = "0";
}
}


private void BindData()
{

SqlConnection MyCon = new SqlConnection(ConStr);
string QueryStr = "SELECT customerid,CompanyName,ContactName,Address FROM customers";
SqlDataAdapter Da = new SqlDataAdapter(QueryStr,MyCon);
DataSet Ds = new DataSet();
Da.Fill(Ds,"Customers");
GridView1.DataSource = Ds.Tables[0];
GridView1.DataKeyNames = new string []{"customerid"};
GridView1.DataBind();

}


private void SetGrid()
{
GridView1.AllowPaging = true;
//GridView1.PageSize = 15;
}


protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
BindData();
}


protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
GridView1.EditRowStyle.BackColor = Color.Black;
BindData();
}


protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
BindData();
}


protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
{
GridViewRow Row = GridView1.Rows[e.NewSelectedIndex];
Response.Write("<script>alert(‘你选择了ID为" + Row.Cells[3].Text + "的行‘);</script>");
}


protected void GridView1_PageIndexChanged(object sender, EventArgs e)
{
Response.Write("<script>alert(‘你切换到了第" + (GridView1.PageIndex+1) + "页‘);</script>");
}


protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
GridViewRow Row = GridView1.SelectedRow;
Row.BackColor = Color.Crimson;
}


protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string ID = GridView1.DataKeys[e.RowIndex].Value.ToString();
//防止非法的输入，预防脚本攻击
string CustomerId = Server.htmlDecode(((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text.ToString());
string CompanyName = Server.HtmlDecode(((TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).Text.ToString());
string ContactName = Server.HtmlDecode(((TextBox)GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).Text.ToString());
string Address = Server.HtmlDecode(((TextBox)GridView1.Rows[e.RowIndex].Cells[6].Controls[0]).Text.ToString());
SqlConnection Con = new SqlConnection(ConStr);
try
{
string UpdateStr = "UPDATE customers SET companyname=‘" + CompanyName + "‘,contactname=‘" + ContactName + "‘,address=‘" + Address + "‘ WHERE customerid=‘" + ID + "‘";
SqlCommand Cmd = new SqlCommand(UpdateStr, Con);
//尽可能晚的打开连接，尽早的关闭连接
Con.Open();
Cmd.ExecuteNonQuery();
GridView1.EditIndex = -1;
BindData();
}
catch (Exception ex)
{
Response.Write("<script>alert(‘编辑出错，请重新填写‘);</script>");
GridView1.EditIndex = -1;
BindData();
}
//要及时的关闭打开的连接，提高程序的性能
finally
{
Con.Dispose();
}
}


protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
string ID = GridView1.DataKeys[e.RowIndex].Value.ToString();
string QueryStr = "DELETE FROM customers WHERE customerid=‘" + ID + "‘";
SqlConnection Con = new SqlConnection(ConStr);
SqlCommand Cmd = new SqlCommand(QueryStr,Con);
try
{
Con.Open();
Cmd.ExecuteNonQuery();
BindData();
Response.Write("<script>alert(‘成功删除‘);</script>");
}
catch (Exception ex)
{
Response.Write("<script>alert(‘删除有误，请检查该表是否与其他表有约束‘);</script>");
}
finally
{
Con.Dispose();
}
}

//****************************************************************************************************************
//当它写为“return confirm();”的时候，后边的任何客户端代码都不可能执行，
//因此你注册时设计处理不可能执行。有些所谓的“示例”代码给你这样写的时候，你要注意，
//它应该并不为按钮注册事件处理方法（注册了就很可笑了，因为根本无用），而是通过设置按钮的CommandName来让gridview处理。
//这种写法下，按钮仅仅是提供命令名称和参数。
//如果你要让后边的代码执行，应该写：
//b.Attributes["onclick"] = "if(!confirm(‘你真的要删除该条记录么?‘))return false;";
//*****************************************************************************************************************
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
{
//这种写法不管你点击的是什么，后面的代码都不会执行。
//((Button)e.Row.Cells[2].Controls[0]).Attributes.Add("onclick", "javascript:return confirm(‘确定要删除"" + e.Row.Cells[3].Text + ""吗？‘)");
//正确的写法
((Button)e.Row.Cells[2].Controls[0]).Attributes["onclick"] = "if(!confirm(‘你真的要删除" + e.Row.Cells[3].Text + "这条记录么?‘))return false;";
}
}