如何在保存到数据库之前显示唯一键异常？
我创建了一个gridview，用户可以在其中输入项目及其数量。项目数量未知，因此要求是能够添加用户想要的项目。所以我已经给出了为另一个条目添加项目行的规定。输入的所有这些数据都会进入一个临时表，只需点击一个按钮即可完成所有这些数据保存到数据库中。
在点击按钮之前，有没有办法隐藏上一行中已选择的项目，或者在选择下拉值时显示项目已经输入的错误。
我的gridview看起来像这样：
gridview代码：
<asp:GridView ID="gvItemList" runat="server" AutoGenerateColumns="False" AutoGenerateDeleteButton="True" BackColor="#CCCCCC" BorderColor="#999999" BorderStyle="Solid" BorderWidth="3px" CellPadding="4" CellSpacing="2" CssClass="newStyle9" ForeColor="Black" OnRowDataBound="gvItemList_RowDataBound" OnRowDeleting="gvItemList_RowDeleting" ShowFooter="True" style="text-align: center" ViewStateMode="Enabled">
<Columns>
<asp:TemplateField HeaderText="Sl No" SortExpression="Id">
<ItemTemplate>
<asp:Label ID="lblId" runat="server" Text="<%# Container.DataItemIndex+1 %>"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Item Description">
<ItemTemplate>
<asp:DropDownList ID="ddlItem" runat="server" Height="25px" Width="200px" AutoPostBack="True" OnSelectedIndexChanged="ddlItem_SelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Unit">
<ItemTemplate>
<asp:Label ID="txtUnit" runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
<asp:TextBox ID="txtQty" runat="server" Height="27px" Width="73px"></asp:TextBox>
</ItemTemplate>
<FooterStyle HorizontalAlign="Right" />
<FooterTemplate>
<asp:Button ID="AddRowButton" runat="server" OnClick="ButtonAdd_Click" Text="Add New Item" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#CCCCCC" />
<HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalAlign="Left" />
<RowStyle BackColor="White" />
<SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F1F1F1" />
<SortedAscendingHeaderStyle BackColor="#808080" />
<SortedDescendingCellStyle BackColor="#CAC9C9" />
<SortedDescendingHeaderStyle BackColor="#383838" />
</asp:GridView>
代码背后：
private void SetInitialRowToGrid()
{
// Initialize and Set initial row of Datatable
var tempDataTable = new DataTable();
tempDataTable.Columns.Add("lblId");
tempDataTable.Columns.Add("ddlItem");
tempDataTable.Columns.Add("txtUnit");
tempDataTable.Columns.Add("txtQty");
tempDataTable.Rows.Add("1", "", "", "");
// Store that datatable into viewstate
ViewState["TempTable"] = tempDataTable;
// Attach Gridview Datasource to datatable
gvItemList.DataSource = tempDataTable;
gvItemList.DataBind();
}
private void AddNewRowToGrid()
{
int rowIndex = 0;
if (ViewState["TempTable"] != null)
{
// Get TempTable from viewstate
var tempTable = (DataTable)ViewState["TempTable"];
DataRow tempRow = null;
if (tempTable.Rows.Count > 0)
{
for (int i = 1; i <= tempTable.Rows.Count; i++)
{
// Get Grid's values
var Item =
(DropDownList)gvItemList.Rows[rowIndex].Cells[2].FindControl("ddlItem");
var Unit =
(Label)gvItemList.Rows[rowIndex].Cells[3].FindControl("txtUnit");
var Qty =
(TextBox)gvItemList.Rows[rowIndex].Cells[4].FindControl("txtQty");
// Create new row and update Row Number
tempRow = tempTable.NewRow();
tempTable.Rows[i - 1]["ddlItem"] = Item.SelectedValue;
tempTable.Rows[i - 1]["txtUnit"] = Unit.Text;
tempTable.Rows[i - 1]["txtQty"] = Qty.Text;
rowIndex++;
}
// Add data to datatable and viewstate
tempTable.Rows.Add(tempRow);
ViewState["TempTable"] = tempTable;
// Attach Gridview Datasource to datatable
gvItemList.DataSource = tempTable;
gvItemList.DataBind();
}
}
//Set Previous Data on Postbacks
SetPreviousData();
}
private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["TempTable"] != null)
{
var tempTable = (DataTable)ViewState["TempTable"];
if (tempTable.Rows.Count > 0)
{
for (int i = 0; i < tempTable.Rows.Count; i++)
{
var Item =
(DropDownList)gvItemList.Rows[rowIndex].Cells[2].FindControl("ddlItem");
var Unit =
(Label)gvItemList.Rows[rowIndex].Cells[3].FindControl("txtUnit");
var Qty =
(TextBox)gvItemList.Rows[rowIndex].Cells[4].FindControl("txtQty");
Item.SelectedValue = tempTable.Rows[i]["ddlItem"].ToString();
Unit.Text = tempTable.Rows[i]["txtUnit"].ToString();
Qty.Text = tempTable.Rows[i]["txtQty"].ToString();
rowIndex++;
}
}
}
}
protected void ButtonAdd_Click(object sender, EventArgs e)
{
AddNewRowToGrid();
}
protected void gvItemList_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
int index = Convert.ToInt32(e.RowIndex);
deleteRow(index);
SetPreviousData();
if (gvItemList.Rows.Count == 0)
{
SetInitialRowToGrid();
}
}
private int deleteRow(int index)
{
int rowIndex = 0;
if (ViewState["TempTable"] != null)
{
// Get TempTable from viewstate
var tempTable = (DataTable)ViewState["TempTable"];
if (tempTable.Rows.Count > 0)
{
for (int i = 1; i <= tempTable.Rows.Count; i++)
{
// Get Grid's TextBox values
var Item =
(DropDownList)gvItemList.Rows[rowIndex].Cells[2].FindControl("ddlItem");
var Unit =
(Label)gvItemList.Rows[rowIndex].Cells[3].FindControl("txtUnit");
var Qty =
(TextBox)gvItemList.Rows[rowIndex].Cells[4].FindControl("txtQty");
}
// Add data to datatable and viewstate
tempTable.Rows.RemoveAt(index);
ViewState["TempTable"] = tempTable;
// Attach Gridview Datasource to datatable
gvItemList.DataSource = tempTable;
gvItemList.DataBind();
}
}
//Set Previous Data on Postbacks
return index;
}
protected void gvItemList_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddlItem = (e.Row.FindControl("ddlItem") as DropDownList);
Jilu1TableAdapters.tbl_ItemTableAdapter item;
item = new Jilu1TableAdapters.tbl_ItemTableAdapter();
DataTable dt = new DataTable();
dt = item.GetItems();
ddlItem.DataSource = dt;
ddlItem.DataTextField = "Item";
ddlItem.DataValueField = "Item";
ddlItem.DataBind();
ddlItem.Items.Insert(0, new System.Web.UI.WebControls.ListItem("--Select an Item--", "0"));
}
}
private void InsertRecords(StringCollection sc)
{
Jilu1TableAdapters.tbl_Jr_BOMTableAdapter ds;
ds = new Jilu1TableAdapters.tbl_Jr_BOMTableAdapter();
StringBuilder sb = new StringBuilder(string.Empty);
string[] splitItems = null;
string user = Page.User.Identity.Name;
try
{
foreach (string item in sc)
{
if (item.Contains(",,,"))
{
//To prevent null reference error
}
else
{
splitItems = item.Split(",".ToCharArray());
ds.InsertJrBOM(ddlState.SelectedValue, ddlDistrict.SelectedValue, ddlCluster.SelectedValue, ddlSiteID.SelectedValue, txtSiteName.Text, ddlSiteType.SelectedValue, txtNoBTS.Text, txtNoLinks.Text, txtLoadBand.Text, ddlEBAvailability.SelectedValue, txtEBPhase.Text, txtDGCapacity.Text, txtDGPhase.Text, splitItems[0], splitItems[1], splitItems[2], user, DateTime.Now, "Nil", 1, txtDispatch.Text);
}
}
lblSuccess.Visible = true;
lblSuccess.Text = "Records Successfully Saved!";
Timer1.Enabled = true;
}
catch (System.Data.SqlClient.SqlException)
{
lblErrorMessage.Visible = true;
lblErrorMessage.Text = "Duplicate Items has been entered, please correct it before proceeding or an entry for " + ddlSiteID.Text + " has already made, please go to edit page to make necessary changes!";
Timer1.Enabled = true;
return;
}
catch (Exception ex)
{
lblErrorMessage.Visible = true;
lblErrorMessage.Text = "Error: " + ex.Message;
Timer1.Enabled = true;
}
}
protected void btnAdd_Click(object sender, EventArgs e)
{
int rowIndex = 0;
StringCollection sc = new StringCollection();
if (ViewState["TempTable"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["TempTable"];
if (dtCurrentTable.Rows.Count > 0)
{
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
//extract the TextBox values
DropDownList ddlItem = (DropDownList)gvItemList.Rows[rowIndex].Cells[2].FindControl("ddlItem");
Label txtUnit = (Label)gvItemList.Rows[rowIndex].Cells[3].FindControl("txtUnit");
TextBox txtQty = (TextBox)gvItemList.Rows[rowIndex].Cells[4].FindControl("txtQty");
//get the values from the TextBoxes
//then add it to the collections with a comma "," as the delimited values
sc.Add(ddlItem.SelectedValue + "," + txtUnit.Text + "," + txtQty.Text);
if (sc.Contains(",,,"))
{
lblErrorMessage.Visible = true;
lblErrorMessage.Text = "Fields should not be left empty!";
Timer1.Enabled = true;
return;
}
else
{
string Quantity = txtQty.Text;
float num;
if (float.TryParse(Quantity, out num))
{
rowIndex++;
}
else
{
lblErrorMessage.Visible = true;
lblErrorMessage.Text = "Quantity field must be a number!";
Timer1.Enabled = true;
return;
}
}
}
//Call the method for executing inserts
InsertRecords(sc);
if (lblSuccess.Text == "Records Successfully Saved!")
{
this.SetInitialRowToGrid();
string user = Page.User.Identity.Name;
StatusTableAdapters.tbl_NotificationsTableAdapter ds2;
ds2 = new StatusTableAdapters.tbl_NotificationsTableAdapter();
ds2.InsertNotification(ddlSiteID.SelectedValue, "BOM Notification", DateTime.Now, user, "Role6");
}
}
}
}
非常感谢任何帮助。
1 个答案:
答案 0 :(得分：1)
protected void ddlItem_SelectedIndexChanged(object sender, EventArgs e)
{
var main = (sender as DropDownList);
foreach (GridViewRow row in gvItemList.Rows)
{
var ddl = (row.FindControl("ddlItem") as DropDownList);
if (main.ClientID != ddl.ClientID && ddl.SelectedValue == main.SelectedValue)
{
row.BackColor = System.Drawing.Color.Red;
string script = "alert('already selected!');";
ScriptManager.RegisterStartupScript(this, GetType(),
"ServerControlScript", script, true);
}
}
}
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