计算具有日期值的文本框？ [英] calculation on textboxes that have date value?

问题描述

我有三个名为`borrower_date_txt，period_txt和ret_date_txt`的文本框，知道我想对这些文本框进行计算，我想在borrower_date_txt中输入日期（不仅是今天的日期），而在period_txt中我输入一个句点ret_date_txt中的示例5我想显示`borrower_date_txt + 5`，即在'ret_date_txt`中'borrower_date_txt'日期值的5天之后给我一个日期？

I have three textboxes named `borrower_date_txt,period_txt and ret_date_txt`, know i want to make calculation on those textboxes, I want to enter the date into the borrower_date_txt (not only today's date) and in the period_txt i enter a period for example 5 in the ret_date_txt i want to display the `borrower_date_txt + 5`, i.e give me the date after 5 days of 'borrower_date_txt' date value in the `ret_date_txt`?

推荐答案

因此，首先将文本框内容转换为相关类型：

So, start by converting the textbox contents to their relevant types:

DateTime borrowedOn;
if (!DateTime.TryParse(borrower_date_txt.Text, out borrowedOn))
    {
    // Report problem to user
    return;
    }
int loanPeriod;
if (!int.TryParse(period_txt.Text, out loanPeriod))
    {
    // Report problem to user
    return;
    }

然后，只需将一个添加到另一个，然后输出。

Then, just add the one to the other, and output it.

ret_date_txt.Text = borrowedOn.AddDays(loanPeriod).ToShortDateString();

尝试自己编写代码。

假设你想要单击按钮时计算return_date，因此您必须在按钮单击事件中编写代码。让我们来看看事件处理过程：

步骤1：如果使用为borrow_date和/或句点输入错误的值类型怎么办？可能，对。在客户端，您可以使用javascript进行验证。在代码隐藏中，您可以使用适当的TryParse方法来实现此目的。看看这个： C＃TryParse [ ^ ]。

步骤2：如果borrow_date（DateTime）和句点（Int32）都通过了TryParse测试，则继续执行步骤3中止。

步骤3：使用适当的DateTime方法将期间添加到borrow_date以获取return_date，请查看： C＃DateTime示例 [ ^ ]

步骤4：最后将return_date传递给相应的文本框。

结束

Try writing the code yourself.
Assuming you want to calculate the return_date upon button click, so you have to write your code in the button click event. Let walk through the event handling process:
Step 1: What if the use enter wrong value type for the borrow_date and/or the period? Possible, right. At the client side, you can javascript to do the validation. At the code-behind, you can use the appropriate TryParse methods to achieve this. Check this out: C# TryParse[^].
Step 2: if both borrow_date (DateTime) and period (Int32) pass the TryParse test, then proceed to step 3 else abort.
Step 3: Use the appropriate DateTime method to add the period to the borrow_date to get the return_date, check this out: C# DateTime Examples[^]
Step 4: Lastly pass the return_date to the appropriate text box.
The End

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