Question

我想要做的是从下面的代码中获取总价格文本框的值，然后再声明：

private void UpdateTotalBill()
    {
        decimal vat = 0;
        decimal TotalPrice = 0;
        long TotalProducts = 0;
        foreach (DataListItem item in dlCartProducts.Items)
        {
            Label PriceLabel = item.FindControl("lblPrice") as Label; // get price 
            TextBox ProductQuantity = item.FindControl("txtProductQuantity") as TextBox; // get quantity

            Int64 priceLabel, productQuantity;
            bool conversionResult = Int64.TryParse(PriceLabel.Text, out priceLabel);
            if (!conversionResult) continue;
            conversionResult = Int64.TryParse(ProductQuantity.Text, out productQuantity);
            if (!conversionResult) continue;
            decimal ProductPrice = priceLabel * productQuantity; //computation fro product price. price * quantity
            vat = (TotalPrice + ProductPrice) * 0.12M; // computation for vat
            vat = Math.Round(vat, 2);
            TotalPrice = TotalPrice + ProductPrice;
            TotalProducts = TotalProducts + productQuantity;
        }
        Label1.Text = Convert.ToString(vat);
        txtTotalPrice.Text = Convert.ToString(TotalPrice + 40.0M + vat); // add vat + 40 delivery charge to total price
        txtTotalProducts.Text = Convert.ToString(TotalProducts);
    }

并以“十进制数量=？”读取：

protected void Button1_Click(object sender, EventArgs e)
    {
        String paymentSwitchUrl = "http://test.dragonpay.ph/Pay.aspx";
        String merchantId = "****";
        String secretKey = "****"; // Application["secretKey"].ToString();
        String txnId = "003";
        decimal amount = Convert.ToDecimal(txtTotalPrice);
        String ccy = "PHP";
        String description = "any description";
        String email = "paolodexter@yahoo.com";

        String message = String.Format("{0}:{1}:{2}:{3}:{4}:{5}:{6}",  
            merchantId, txnId, amount.ToString("#0.00"), ccy, description, email,
            secretKey);
        String digest = GetSHA1Digest(message); 

        String redirectString = 
        String.Format("{0}?merchantid={1}&txnid={2}&amount={3}&ccy={4}&" + 
            "description={5}&email={6}&digest={7}&message={8}", 
            paymentSwitchUrl, 
            merchantId,
            txnId, 
            amount.ToString("#0.00"), 
            ccy, 
            Server.UrlEncode(description),
            Server.UrlEncode(email), 
            digest,
            message); 

        // send browser to Payment Switch 
        Response.Redirect(redirectString, true);
    }

我尝试了这行代码：

decimal amount = Convert.ToDecimal(txtTotalPrice);

但它给我一个错误说：

'System.Web.UI.WebControls.TextBox' to type 'System.IConvertible'.

任何帮助都非常感谢。

Answer 1

您正在尝试将文本框组件（而不是其包含的文本）转换为decimal。一个简单的改变将解决这个问题：

decimal amount = Convert.ToDecimal(txtTotalPrice.Text);

Answer 2

十进制数量= Convert.ToDecimal（txtTotalPrice）;

这一行实际上是在尝试将Textbox控件转换为十进制

您需要使用＆＃34; 文字＆＃34;您在页面加载期间执行的属性。此外，建议始终使用TryParse（）而不是显式转换来处理运行时转换错误。

decimal.TryParse（TextBox1.Text，out decimal_val）;

无法从文本框中获取价值

2 个答案: