我试图从字符串转换为整数。输入格式不正确显示

debugcn 发表于 Dev

法赫德

我试图从字符串转换为 int 以进行计算。我拥有的是 double 格式的 total_amount 和 string 格式的 unit_quantity 。我想将 Unit_quantity 字符串更改为 int。这两个值都取自数据库，total_amount 的数据类型为 float，unit_quantity 的数据类型为 string。

我试过普通的 int.parse 选项，但它不起作用。

        double UnitAmt = double.Parse(TextboxunitAmt.Text);
        string UnitQty = TextboxunitQty.Text.ToString();

        int Qty = int.Parse(UnitQty);
        double GrandTotal = UnitAmt * Qty;

        TextboxCostPrice.Text = GrandTotal.ToString();

预期的结果是正确的计算。但我得到的是“输入格式不正确”之类的错误

蓝眼巨兽

本质上，您必须查看您传递给解析函数的输入。

尝试类似以下的操作，以了解更多正在发生的事情。

    // Lets try parsing some random strings into doubles.
    // Each one with varying cases.
    string[] testStrings = new string[]{"$32.43", "342", "1,332", "0.93", "123,432.34", "boat"};
    foreach (string ts in testStrings)
    {
        double newValue;
        if (double.TryParse(ts, out newValue))
        {
            // for WPF, you can use a MessageBox or Debug.WriteLine
            Console.WriteLine("We were able to successfully convert '" + ts + "' to a double! Here's what we got: " + newValue);
        }
        else
        {
            // for WPF, you can use a MessageBox or Debug.WriteLine
            Console.WriteLine("We were unable to convert '" + ts + "' to a double");
        }
    }

这是您应该看到的输出：

We were unable to convert '$32.43' to a double
We were able to successfully convert '342' to a double! Here's what we got: 342
We were able to successfully convert '1,332' to a double! Here's what we got: 1332
We were able to successfully convert '0.93' to a double! Here's what we got: 0.93
We were able to successfully convert '123,432.34' to a double! Here's what we got: 123432.34
We were unable to convert 'boat' to a double

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