C# 计算文本框上的总数'；asp.Net中的s TextChanged（）事件

我有一个小应用程序如下

<tr>
        <td class="auto-style3">
            Material Quantity</td>
        <td class="auto-style4">
            <asp:TextBox ID="txtMQty" runat="server" Width="87px" AutoPostBack="True" OnTextChanged="txtMQty_TextChanged"></asp:TextBox></td>
        <td>
            <asp:RequiredFieldValidator ID="RFVMQty" runat="server" ForeColor="Red" Display="Dynamic" ControlToValidate="txtMQty" ErrorMessage="Please provide Material Quantity" ValidationGroup="CreateVal"></asp:RequiredFieldValidator>
            <asp:RegularExpressionValidator ID="REVMQty" runat="server" ForeColor="Red" Display="Dynamic" ControlToValidate="txtMQty" ErrorMessage="Please provide proper Quantity in number format" ValidationExpression="^\d+$" ValidationGroup="CreateVal"></asp:RegularExpressionValidator>
        </td>
    </tr>
    <tr>
 <tr>
        <td class="auto-style3">Material Rate</td>
        <td class="auto-style4">
            <asp:UpdatePanel ID="UpdateRate" runat="server">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="txtMQty" EventName="TextChanged" />
                </Triggers>
                <ContentTemplate>
            <asp:TextBox ID="txtMRate" runat="server" Width="87px" ReadOnly="True"></asp:TextBox>
                    </ContentTemplate>
        </asp:UpdatePanel>
                    </td>
        <td></td>
    </tr>
    <tr>
        <td>
            PO Total
        </td>
        <td class="auto-style4">
            <asp:UpdatePanel ID="UpdateTotal" runat="server">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="txtMQty" EventName="TextChanged" />
                </Triggers>
                <ContentTemplate>
            <asp:TextBox ID="txtTotal" runat="server" Width="87px" ReadOnly="True"></asp:TextBox>
                    </ContentTemplate>
        </asp:UpdatePanel>
        </td>
    </tr>
    <tr>

在此字段中，物料费率和采购订单总额为只读字段。我想根据公式计算材料数量变化的总数（总数=比率*数量）

我对物料数量的

TextChanged（）

进行了编码，并将

auotoppostback

更改为

True

我试过的代码如下：

protected void txtMQty_TextChanged(object sender, EventArgs e)
{
 checkTotal();
}

//I am saving Rate in ViewState["Rate"] and retrieving here.
private void checkTotal()
{
 Rate = Convert.ToInt32(ViewState["Rate"]);
 txtMQty.Text = string.Empty;
 if (Rate > 0 && txtMQty.Text == string.Empty)
 {
  txtMRate.Text = Rate.ToString();
  txtTotal.Text = Rate.ToString();
 }
 Regex reg = new Regex("[^0-9]+$");
 var str = txtMQty.Text.ToString();
 str = reg.Replace(str, string.Empty);
 if (str.Length > 0)
 {
 var qty = Convert.ToInt32(txtMQty.Text.ToString());
 int total = (Rate* qty);
 txtTotal.Text = total.ToString();
 }
 }

我还使用UpdatePanel来避免往返。我的问题是当我输入Quantity

txtMQty

的

TextChaged（）

事件应该触发，但它没有触发。不知道怎么回事

我的.aspx页面如下所示

<tr>
        <td class="auto-style3">
            Material Quantity</td>
        <td class="auto-style4">
            <asp:TextBox ID="txtMQty" runat="server" Width="87px" AutoPostBack="True" OnTextChanged="txtMQty_TextChanged"></asp:TextBox></td>
        <td>
            <asp:RequiredFieldValidator ID="RFVMQty" runat="server" ForeColor="Red" Display="Dynamic" ControlToValidate="txtMQty" ErrorMessage="Please provide Material Quantity" ValidationGroup="CreateVal"></asp:RequiredFieldValidator>
            <asp:RegularExpressionValidator ID="REVMQty" runat="server" ForeColor="Red" Display="Dynamic" ControlToValidate="txtMQty" ErrorMessage="Please provide proper Quantity in number format" ValidationExpression="^\d+$" ValidationGroup="CreateVal"></asp:RegularExpressionValidator>
        </td>
    </tr>
    <tr>
 <tr>
        <td class="auto-style3">Material Rate</td>
        <td class="auto-style4">
            <asp:UpdatePanel ID="UpdateRate" runat="server">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="txtMQty" EventName="TextChanged" />
                </Triggers>
                <ContentTemplate>
            <asp:TextBox ID="txtMRate" runat="server" Width="87px" ReadOnly="True"></asp:TextBox>
                    </ContentTemplate>
        </asp:UpdatePanel>
                    </td>
        <td></td>
    </tr>
    <tr>
        <td>
            PO Total
        </td>
        <td class="auto-style4">
            <asp:UpdatePanel ID="UpdateTotal" runat="server">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="txtMQty" EventName="TextChanged" />
                </Triggers>
                <ContentTemplate>
            <asp:TextBox ID="txtTotal" runat="server" Width="87px" ReadOnly="True"></asp:TextBox>
                    </ContentTemplate>
        </asp:UpdatePanel>
        </td>
    </tr>
    <tr>

物料量
材料价格
采购订单总额

您需要在导致事件的文本框上启用自动回发

<asp:TextBox ID="txtMQty" runat="server" AutoPostBack="True"></asp:TextBox> 

编辑：
很抱歉，您还需要分配事件：

<asp:TextBox ID="txtMQty" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged"></asp:TextBox> 

这是您的问题：

您正在使用多个更新面板。并试图触发一个不在updatepanel中的文本框。触发器在更新面板中找到控件，然后进行回发。但是您的txtMQty不在更新面板内。所以触发器不起作用

如果您使用单个更新面板，您的问题将得到解决。请检查下面给出的代码。这对你有用

<asp:updatepanel id="UpdatePanel1" runat="server">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="txtMQty" EventName="TextChanged" />
    </Triggers>
    <ContentTemplate>
        Material Quantity
        <asp:TextBox ID="TextBox1" runat="server" Width="87px" AutoPostBack="True" OnTextChanged="txtMQty_TextChanged"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ForeColor="Red" Display="Dynamic" ControlToValidate="txtMQty" ErrorMessage="Please provide Material Quantity" ValidationGroup="CreateVal"></asp:RequiredFieldValidator>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ForeColor="Red" Display="Dynamic" ControlToValidate="txtMQty" ErrorMessage="Please provide proper Quantity in number format" ValidationExpression="^\d+$" ValidationGroup="CreateVal"></asp:RegularExpressionValidator>
        <br />
        <br />
        Material Rate
        <asp:TextBox ID="TextBox2" runat="server" Width="87px" ReadOnly="True" >5</asp:TextBox>
        <br />
        <br />
        PO Total
        <asp:TextBox ID="TextBox3" runat="server" Width="87px" ReadOnly="True"></asp:TextBox>
    </ContentTemplate>
</asp:updatepanel>

物料量




材料价格
5.




采购订单总额

---

这是一个正常工作的html设计器。

在updatepanel中使用触发器，并为event=TextChangedwhy应该使用updatepanel？为什么要将txtMQty设置为空？@krunalpati我使用了Trigger@AbdurRahim我使用了updatepanel，因为我不希望每次文本更改都往返于服务器。请检查我的新答案。我希望这能解决你的问题。