C# Gridview在更新前检查所有行

我有一个gridview，它有一个sqldatasource。我的数据应该是这样的：

但在任何一行上，当我单击“编辑”按钮，然后单击“更新”按钮时，我想检查它的前一行“结束价格”必须小于此行的开始价格。此外，此行的结束价格必须小于下一行的开始价格

如果未发生这种情况，则必须通知用户，因为此范围必须符合顺序

这是我的密码：

        protected void UpdateRecord(object sender, GridViewUpdateEventArgs e)
    {


        if (e.RowIndex == 0 && GridView1.Rows.Count != 1)
        {
            // Next Row Starting Value
            TextBox txtNextStartingPoint = GridView1.Rows[e.RowIndex + 1].FindControl("txtStartingRange") as TextBox;

            // This row ending value
            TextBox txtThisEndingRange = GridView1.Rows[e.RowIndex].FindControl("txtEndingRange") as TextBox;

            if (Convert.ToDecimal(txtThisEndingRange.Text) >= Convert.ToDecimal(txtNextStartingPoint))
            {
                NotificationHelper.ShowError(this, "Invalid Ending Value");
                e.Cancel = true;
                return;
            }

        }

        TextBox txtStartingPoint = GridView1.Rows[e.RowIndex].FindControl("txtStartingRange") as TextBox;
        TextBox txtEndingRange = GridView1.Rows[e.RowIndex].FindControl("txtEndingRange") as TextBox;
        TextBox txtDiscount_Percentage = GridView1.Rows[e.RowIndex].FindControl("txtDiscount_Percentage") as TextBox;
        Label txtDiscount_ID = GridView1.Rows[e.RowIndex].FindControl("lblId") as Label;


        SqlDataSource1.UpdateParameters["sr"].DefaultValue = txtStartingPoint.Text;
        SqlDataSource1.UpdateParameters["re"].DefaultValue = txtEndingRange.Text;
        SqlDataSource1.UpdateParameters["perc"].DefaultValue = txtDiscount_Percentage.Text;
        SqlDataSource1.UpdateParameters["discount_ID"].DefaultValue = txtDiscount_ID.Text;


        SqlDataSource1.Update();
    }



    /// <summary>
    /// Edit record
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void editRecord(object sender, GridViewEditEventArgs e)
    {
        // Get the current row index for edit record
        GridView1.EditIndex = e.NewEditIndex;

    }


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

这是我的gridview标记

   <asp:GridView ID="GridView1" runat="server" ShowHeaderWhenEmpty="True" AutoGenerateColumns="False"
                OnRowCancelingEdit="cancelRecord" OnRowEditing="editRecord" OnRowUpdating="UpdateRecord"
                CellPadding="4" GridLines="None" Width="673px" ForeColor="#333333" 
                DataSourceID="SqlDataSource1" OnDataBound="GridView1_DataBound"
                >
                <RowStyle HorizontalAlign="Center" />
                <AlternatingRowStyle BackColor="White" />
                <EditRowStyle BackColor="#7C6F57" />
                <FooterStyle BackColor="#1C5E55" ForeColor="White" Font-Bold="True" />
                <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
                <RowStyle BackColor="#E3EAEB" />
                <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
                <Columns>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Id</HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="lblId" runat="server" Text='<%#Bind("discount_id")%>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Starting Point</HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="lblStartingRange" runat="server" Text='<%#Bind("starting_range") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:TextBox ID="txtStartingRange" runat="server" Text='<%#Bind("starting_range") %>'
                                MaxLength="50"></asp:TextBox>
                        </EditItemTemplate>
                        <FooterTemplate>
                            <asp:TextBox ID="txtNewStartingRange" runat="server" MaxLength="50"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Ending Range</HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="lblEndingRange" runat="server" Text='<%#Bind("ending_range") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:TextBox ID="txtEndingRange" runat="server" Text='<%#Bind("ending_range") %>'
                                MaxLength="2"></asp:TextBox>
                        </EditItemTemplate>
                        <FooterTemplate>
                            <asp:TextBox ID="txtEndingRange" runat="server" MaxLength="2"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Discount Percentage</HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label ID="lbldiscount_percentage" runat="server" Text='<%#Bind("discount_percentage") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:TextBox ID="txtDiscount_Percentage" runat="server" Text='<%#Bind("discount_percentage") %>'
                                MaxLength="10"></asp:TextBox>
                        </EditItemTemplate>
                        <FooterTemplate>
                            <asp:TextBox ID="txtNewDiscount_Percentage" runat="server" MaxLength="10"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Operation</HeaderTemplate>
                        <ItemTemplate>
                            <asp:Button ID="btnEdit" runat="server" CommandName="Edit" Text="Edit" />
                            <asp:Button ID="btnDelete" runat="server" CommandName="Delete" Text="Delete" CausesValidation="true"
                                OnClientClick="return confirm('Are you sure?')" />
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:Button ID="btnUpdate" runat="server" CommandName="Update" Text="Update" />
                            <asp:Button ID="btnCancel" runat="server" CommandName="Cancel" Text="Cancel" CausesValidation="false" />
                        </EditItemTemplate>
                        <FooterTemplate>
                        </FooterTemplate>
                    </asp:TemplateField>
                </Columns>
                <EmptyDataTemplate>
                    No record available
                </EmptyDataTemplate>
            </asp:GridView>

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我该怎么办？有什么想法吗？

其他查询返回这样的值

// This row ending value
TextBox txtThisEndingRange = GridView1.Rows[e.RowIndex].FindControl("txtEndingRange") as TextBox;

或者它们也是空的

您可以尝试不强制转换该值。请尝试此操作

var txtNextStartingPoint = GridView1.Rows[e.RowIndex + 1].FindControl("txtStartingRange")

---

也许你得到的不是一个文本框。

有两点需要注意：

1.）获取当前行（正在编辑的行）的值 在这种情况下，值位于

文本框

控件内，因为行现在处于编辑模式。

// This row ending value
TextBox txtThisEndingRange = GridView1.Rows[e.RowIndex].FindControl("txtEndingRange") as TextBox;

2.）从下一行（正在编辑的当前行旁边的行）获取值 在这种情况下，行值位于

标签

控件内，因为行不处于

编辑

模式，而是处于

正常

模式。

// This row ending value
TextBox txtThisEndingRange = GridView1.Rows[e.RowIndex].FindControl("txtEndingRange") as TextBox;

这意味着

控件当前由GridView呈现，而不是

控件

因此，现在您可以猜测，您不需要查找

TextBox:txtStartingRange

，但必须获得

标签：lblStartingRange

// Next Row starting Value
Label lblNextStartRange= GridView1.Rows[e.RowIndex + 1].FindControl("lblStartingRange") as Label;

现在，按照以下步骤对值进行常规检查/比较：

if (Convert.ToDecimal(txtThisEndingRange.Text) >= Convert.ToDecimal(lblNextStartRange.Text))
{
..
..
}

---

TXThisEndingRange正在返回正在编辑的当前行的正确值。。。但是txtNextStartingPoint是null@FlopScientist请检查编辑