ListView控件(一)--增，删，改，查

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在解决获到ListView Insert 获取输入值的处理办法可参考以下：

http://www.cnblogs.com/chencaixia/articles/989498.html

ASP.NET3.5中包含了新的数据绑定控件--ListView，这是一个类似与repeater与gridview结合的控件，可以实现添加，删除功能，同时还可以像repeater一样灵活的控制页面的布局。该控件包含了很多新的模板，比如GroupTemplate等新增的模板，可以方便的分组显示数据。详细的大家可以去查MSDN文档。

我一直认为学习数据绑定控件从最简单的增删改查开始，可以对该控件有较深刻的理解，这样可以举一反三，在进行综合运用。今天这篇文章还是从最基本的数据操作开始，对ListView有个感性的认识。

首先看一下程序运行的效果：

页面源码：

<asp:ListView ID="ListView1" runat="server" OnSelectedIndexChanging="ListView1_SelectedIndexChanging"

OnItemCommand="ListView1_ItemCommand"

OnItemEditing="ListView1_ItemEditing" OnItemCanceling="ListView1_ItemCanceling"

OnItemDataBound="ListView1_ItemDataBound" OnPagePropertiesChanging="ListView1_PagePropertiesChanging"

OnItemInserting="ListView1_ItemInserting" OnItemUpdating="ListView1_ItemUpdating"

OnSorting="ListView1_Sorting" EnableViewState="true"

InsertItemPosition="LastItem" onitemdeleting="ListView1_ItemDeleting">

<asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>

<p>

<asp:DataPager ID="MyPage" runat="server" PageSize="6">

<asp:NumericPagerField ButtonCount="10" PreviousPageText="<-- " NextPageText="-->" />

<%-- <asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="true" ShowLastPageButton="true"

ShowNextPageButton="true" ShowPreviousPageButton="true" />--%>

</Fields>

</asp:DataPager>

</p>

</LayoutTemplate>

<i>

<%#Eval("SupplierID")%></i>

<p>

<b>

<%#Eval("CompanyName")%></b></p>

<p>

<%#Eval("ContactName")%></p>

<p>

<%#Eval("Address")%></p>

<p>

<%#Eval("City")%></p>

<asp:Button ID="btnEdit" runat="server" Text="Edit" CommandName="Edit" />

<asp:Button ID="btnDelete" runat="server" Text="Delete" CommandName="Delete" />

<%-- <asp:LinkButton ID="lbtnSort" runat="server" Text="Sort" CommandName="Sort" CommandArgument="CompanyName" ></asp:LinkButton>--%>

</ItemTemplate>

<asp:TextBox ID="txtMy" runat="server" Text='<%#bind("SupplierID") %>'></asp:TextBox>

<asp:TextBox ID="TextBox1" runat="server" Text='<%#bind("CompanyName") %>'></asp:TextBox>

<asp:TextBox ID="TextBox2" runat="server" Text='<%#bind("ContactName") %>'></asp:TextBox>

<asp:TextBox ID="TextBox3" runat="server" Text='<%#bind("Address") %>'></asp:TextBox>

<asp:TextBox ID="TextBox4" runat="server" Text='<%#bind("City") %>'></asp:TextBox>

<asp:Button ID="btnUpdate" runat="server" Text="Update" CommandName="Update" />

<asp:Button ID="btnCancle" runat="server" Text="Cancle" CommandName="Cancel" />

</EditItemTemplate>

<asp:TextBox ID="txtMy" runat="server" Text='<%#bind("SupplierID") %>'></asp:TextBox>

<asp:TextBox ID="TextBox1" runat="server" Text='<%#bind("CompanyName") %>'></asp:TextBox>

<asp:TextBox ID="TextBox2" runat="server" Text='<%#bind("ContactName") %>'></asp:TextBox>

<asp:TextBox ID="TextBox3" runat="server" Text='<%#bind("Address") %>'></asp:TextBox>

<asp:TextBox ID="TextBox4" runat="server" Text='<%#bind("City") %>'></asp:TextBox>

<asp:Button ID="btnUpdate" runat="server" Text="Insert" CommandName="Insert" />

<asp:Button ID="btnCancle" runat="server" Text="Cancle" CommandName="Cancel" />

</InsertItemTemplate>

</div>

</ItemSeparatorTemplate>

</asp:ListView>

这部分代码中有个重要的部分就是通过<LayoutTemplate>模板来设置控件的样式，布局，这也是新增的模板。在VS.NET2008的正式版本中，要正常运行页面必须在该模板中加入一个名为itemPlaceholder的PlaceHolder控件。要不会出现如下异常：

An item placeholder must be specified on ListView 'ListView1'. Specify an item placeholder by setting a control's ID property to "itemPlaceholder".

<ItemTemplate>模板用来绑定显示到页面上的数据， <EditItemTemplate>用来显示处于编辑状态的时候显示的数据，其他的可以以此类推。

与ListView还搭配的一起使用了新增的DataPager控件，这个主要是用于ListView控件的分页，是新增的分页空也，可以方便，高效的进行分页。

后台代码：

string ConStr = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

ViewState["SupplierID"] = "SupplierID";

ViewState["Direction"] = "DESC";

BindListView();

}

private void BindListView()

{

string QueryCon = "SELECT SupplierID,CompanyName,ContactName,Address,City FROM Suppliers";

SqlConnection NorthWindCon = new SqlConnection(ConStr);

SqlDataAdapter NorthWindDa = new SqlDataAdapter(QueryCon, ConStr);

DataSet Ds = new DataSet();

NorthWindDa.Fill(Ds, "Suppliers");

ListView1.DataKeyNames = new string[] { "SupplierID" };

DataView Dv = Ds.Tables["Suppliers"].DefaultView;

//排序表达式

string SortExpress = (string)ViewState["SupplierID"] + " " + (string)ViewState["Direction"];

Dv.Sort = SortExpress;

//绑定数据源

//ListView1.DataSource = Ds.Tables["Suppliers"];

ListView1.DataSource = Dv;

ListView1.DataBind();

}

protected void ListView1_ItemEditing(object sender, ListViewEditEventArgs e)

{

ListView1.EditIndex = e.NewEditIndex;

BindListView();

}

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)

{

if (e.Item.ItemType == ListViewItemType.DataItem)

{

((Button)e.Item.FindControl("btnDelete")).Attributes["onclick"] = "if(!confirm('你真的要删除这条记录么?'))return false;";

}

protected void ListView1_ItemCanceling(object sender, ListViewCancelEventArgs e)

{

//取消编辑

if (e.CancelMode == ListViewCancelMode.CancelingEdit)

{

//e.Cancel = true;

ListView1.EditIndex = -1;

BindListView();

ShowMessage("取消编辑");

}

else if (e.CancelMode == ListViewCancelMode.CancelingInsert)

{

//BindListView();

return;

}

protected void ListView1_ItemInserting(object sender, ListViewInsertEventArgs e)

{

((TextBox)ListView1.InsertItem.FindControl("txtMy")).ReadOnly = true;

string CompanyName = Server.HtmlEncode(((TextBox)ListView1.InsertItem.FindControl("TextBox1")).Text.ToString());

string ContactName = Server.HtmlEncode(((TextBox)ListView1.InsertItem.FindControl("TextBox2")).Text.ToString());

string Address = Server.HtmlEncode(((TextBox)ListView1.InsertItem.FindControl("TextBox3")).Text.ToString());

string City = Server.HtmlEncode(((TextBox)ListView1.InsertItem.FindControl("TextBox4")).Text.ToString());

string InsertQuery = "INSERT INTO Suppliers (CompanyName,ContactName,Address,City) VALUES ('" + CompanyName + "','" + ContactName + "','" + Address + "','" + City + "')";

SqlConnection InsertCon = new SqlConnection(ConStr);

SqlCommand InsertCmd = new SqlCommand(InsertQuery, InsertCon);

try

{

InsertCon.Open();

InsertCmd.ExecuteNonQuery();

BindListView();

//将插入行显示到最后

ListView1.InsertItemPosition = InsertItemPosition.LastItem;

}

catch

{

ShowMessage("插入新数据出错，请重新输入");

}

finally

{

InsertCon.Dispose();

InsertCmd.Dispose();

}

protected void ListView1_ItemUpdating(object sender, ListViewUpdateEventArgs e)

{

string KeyId = ListView1.DataKeys[e.ItemIndex].Value.ToString();

//找到listview改行的数据集合

string CompanyName = Server.HtmlEncode(((TextBox)ListView1.Items[e.ItemIndex].FindControl("TextBox1")).Text.ToString());

string ContactName = Server.HtmlEncode(((TextBox)ListView1.Items[e.ItemIndex].FindControl("TextBox2")).Text.ToString());

string Address = Server.HtmlEncode(((TextBox)ListView1.Items[e.ItemIndex].FindControl("TextBox3")).Text.ToString());

string City = Server.HtmlEncode(((TextBox)ListView1.Items[e.ItemIndex].FindControl("TextBox4")).Text.ToString());

string UpdateStr = "UPDATE Suppliers SET CompanyName='" + CompanyName + "',ContactName='" + ContactName + "'," +

"Address='" + Address + "',City='" + City + " 'WHERE SupplierID='" + KeyId + "' ";

SqlConnection UpdateCon = new SqlConnection(ConStr);

SqlCommand UpdateCmd = new SqlCommand(UpdateStr, UpdateCon);

try

{

UpdateCon.Open();

UpdateCmd.ExecuteNonQuery();

ListView1.EditIndex = -1;

BindListView();

}

catch

{

ShowMessage("更新出错，请重新编辑");

}

finally

{

UpdateCon.Dispose();

UpdateCmd.Dispose();

}

protected void ListView1_Sorting(object sender, ListViewSortEventArgs e)

{

if (ViewState["SupplierID"].ToString() == e.SortExpression)

{

if (ViewState["Direction"].ToString() == "DESC")

{

ViewState["Direction"] = "ASC";

}

else

{

ViewState["Direction"] = "DESC";

}

else

{

ViewState["SupplierID"] = e.SortExpression;

}

BindListView();

}

private void ShowMessage(string Message)

{

Literal TxtMsg = new Literal();

TxtMsg.Text = "<script>alert('" + Message + "')</script>";

Page.Controls.Add(TxtMsg);

}

protected void ListView1_ItemDeleting(object sender, ListViewDeleteEventArgs e)

{

string KeyID = ListView1.DataKeys[e.ItemIndex].Value.ToString();

string DeleteStr = "DELETE FROM Suppliers WHERE SupplierID='" + KeyID + "'";

SqlConnection DeleteCon = new SqlConnection(ConStr);

SqlCommand DeleteCmd = new SqlCommand(DeleteStr, DeleteCon);

try

{

DeleteCon.Open();

DeleteCmd.ExecuteNonQuery();

BindListView();

ShowMessage("删除成功");

}

catch

{

ShowMessage("删除出错，请检查数据是否有关联");

}

finally

{

DeleteCon.Dispose();

DeleteCmd.Dispose();

}

以前的edit_cancel事件在ListView控件中为item_cancel，在该事件中可以判断是取消编辑还是取消插入新的数据。大家可以看代码。本篇文章主要是对ListView控件一些基本的事件的运用。下一篇会继续深入的学习该控件。

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