网上购物系统（Task011）——FormView插入删除商品详细信息

源代码：13033480群共享

一、进入插入模板

1、protectedvoid fvwItemDetails_ModeChanging(object sender,FormViewModeEventArgs
e)函数中添加代码：

case FormViewMode.Insert:

this.fvwItemDetails.ChangeMode(FormViewMode.Insert);

break;

2、此时，可进入插入模板，不过，不显示任何信息，也不能够获得下拉列表框的句柄，须添加PreRender()消息响应函数，在这个消息响应函数中添加填充下拉列表框的代码：

protected
void fvwItemDetails_PreRender(object sender,EventArgs e)

{

if (fvwItemDetails.CurrentMode ==FormViewMode.Insert)

{

DropDownList ddl = (DropDownList)fvwItemDetails.FindControl("ddlCategories");

if (ddl !=
null)

{

BindDropDownList(ddl);

}

}

}

二、修改BindDropDownList()函数

private void BindDropDownList(DropDownList ddl)
{
ddl.DataSource = new Category().GetCategories();
ddl.DataTextField = "Name";
ddl.DataValueField = "CategoryId";
ddl.DataBind();

if (ViewState["SelectedCategoryId"] != null)
{
ListItem selectedItem = ddl.Items.FindByValue(ViewState["SelectedCategoryId"].ToString());
if (selectedItem != null)
selectedItem.Selected = true;
}
else
{
string selectcategory = Request.QueryString["categoryId"].ToString();
ListItem selectedItem = ddl.Items.FindByValue(selectcategory);
if (selectedItem != null)
selectedItem.Selected = true;
}
}

三、添加消息响应函数fvwItemDetails_ItemInserting()

protected void fvwItemDetails_ItemInserting(object sender, FormViewInsertEventArgs e)
{
ItemDetails itemdetails = new ItemDetails();
if (ViewState["ImageUrl"] != null)
{
itemdetails.Image = ViewState["ImageUrl"].ToString();
}

if (ViewState["SelectedCategoryId"] != null)
{

DropDownList ddl = (DropDownList)fvwItemDetails.FindControl("ddlCategories");
itemdetails.CategoryId = ViewState["SelectedCategoryId"].ToString();
}

TextBox txtname = (TextBox)fvwItemDetails.FindControl("txtName");
itemdetails.Name = txtname.Text;

TextBox txtPrice = (TextBox)fvwItemDetails.FindControl("txtPrice");
itemdetails.Price = decimal.Parse(txtPrice.Text);

TextBox txtDescn = (TextBox)fvwItemDetails.FindControl("txtDescn");
itemdetails.Descn = txtDescn.Text;

TextBox txtSupplyTime = (TextBox)fvwItemDetails.FindControl("txtSupplyTime");
itemdetails.SupplyTime = txtSupplyTime.Text;

TextBox txtSupplyDate = (TextBox)fvwItemDetails.FindControl("txtSupplyDate");
itemdetails.SupplyDate = txtSupplyDate.Text;

TextBox txtSupplyArea = (TextBox)fvwItemDetails.FindControl("txtSupplyArea");
itemdetails.SupplyArea = txtSupplyArea.Text;

Item item = new Item();
item.InsertItem(itemdetails);

fvwItemDetails.ChangeMode(FormViewMode.ReadOnly);

BindFormView();
ViewState["ImageUrl"] = null;
ViewState["SelectedCategoryId"] = null;

}

四、在数据访问层DAL的Item.cs类中，添加InsertItem(ItemDetails item)函数

public void InsertItem(ItemDetails item)
{
SqlParameter[] parms;
parms = new SqlParameter[]
{
new SqlParameter("@ItemId",SqlDbType.Int),
new SqlParameter("@CategoryId",SqlDbType.VarChar,20),
new SqlParameter("@Name",SqlDbType.VarChar,80),
new SqlParameter("@Price",SqlDbType.Decimal,10),
new SqlParameter("@Image",SqlDbType.VarChar,80),
new SqlParameter("@Descn",SqlDbType.VarChar,80),
new SqlParameter("@SupplyTime",SqlDbType.VarChar,80),
new SqlParameter("@SupplyDate",SqlDbType.VarChar,80),
new SqlParameter("@SupplyArea",SqlDbType.VarChar,80)
};

parms[0].Value = item.ItemId;
parms[1].Value = item.CategoryId;
parms[2].Value = item.Name;
parms[3].Value = item.Price;
parms[4].Value = item.Image;
parms[5].Value = item.Descn;
parms[6].Value = item.SupplyTime;
parms[7].Value = item.SupplyDate;
parms[8].Value = item.SupplyArea;

SqlHelper.ExecuteNonQuery(SqlHelper.ConnectionStringLocalTransaction, CommandType.Text, SQL_INSERT_ITEM, parms);
}

五、FormView删除详细信息比较简单，不过，步骤和前面是一样的。

1、添加消息响应函数

protected void fvwItemDetails_ItemDeleting(object sender, FormViewDeleteEventArgs e)
{
ItemDetails itemdetails = new ItemDetails();
itemdetails.ItemId = int.Parse(Request.QueryString["itemId"]);
Item item = new Item();
item.DeleteItem(itemdetails);
Image img = (Image)fvwItemDetails.FindControl("imgItem");
File.Delete(Server.MapPath(img.ImageUrl));
BindFormView();
}

在删除数据库数据的同时，删除了服务器端文件。

2、在数据访问层DAL的Item.cs类中，添加DeleteItem(ItemDetails item)函数

public void DeleteItem(ItemDetails item)
{
SqlParameter[] parms;
parms = new SqlParameter[]
{
new SqlParameter("@ItemId",SqlDbType.Int)
};

parms[0].Value = item.ItemId;

SqlHelper.ExecuteNonQuery(SqlHelper.ConnectionStringLocalTransaction, CommandType.Text, SQL_DELETE_ITEM, parms);
}

六、浏览Default.aspx，查看运行结果。

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