c# - 将多个文本框的相似验证与不同的验证结果文本结合起来

Question

我有一份报告，可以通过 StartDate + EndDate、BookingID、CardNumber 和 进行过滤>金额。

这些由 2 个日期选择器和 4 个文本框(CardNumber 拆分为 2 个文本框)表示，并且有一个 Search 按钮可返返回告。我在下面的搜索点击代码运行良好，我想知道我是否可以组合部分或全部验证代码以减少代码行数？大多数验证代码类似于 I.E 检查 BookingID、CardNumber 和 Amount 是否作为整数输入。

我知道这个问题接近于代码审查，所以请让我知道是否应该在其他地方提问。

protected void ibtnSearch_Click(object sender, ImageClickEventArgs e)
{
    lblInputMessage.Visible = false;
    DateTime dtStart, dtEnd;
    bool isGood = DateTime.TryParse(txtEndDate.Text, out dtEnd);

    if (DateTime.TryParse(txtStartDate.Text, out dtStart))
    {
        if (txtEndDate.Text.Trim() == "")
        {
            dtEnd = DateTime.Now;
            isGood = true;
        }
    }

    if (txtBookingID.Text.Length > 0)
    {
        int newBookingID;
        if (int.TryParse(txtBookingID.Text, out newBookingID))
        {
            isGood = true;
        }

        else
        {
            lblInputMessage.Visible = true;
            lblInputMessage.Text = "Please enter a valid BookingID.";
            return;
        }
    }

    if (txtAmount.Text.Length > 0)
    {
        int newAmount;
        if (int.TryParse(txtAmount.Text, out newAmount))
        {
            isGood = true;
        }

        else
        {
            lblInputMessage.Visible = true;
            lblInputMessage.Text = "Please enter a valid Amount.";
            return;
        }
    }

    if (txtCardNumber1.Text.Length > 0 || txtCardNumber2.Text.Length > 0)
    {
        int newCardNumber1;
        int newCardNumber2;
        if (int.TryParse(txtCardNumber1.Text, out newCardNumber1) && (int.TryParse(txtCardNumber2.Text, out newCardNumber2)))
        {
            isGood = true;
        }

        else
        {
            lblInputMessage.Visible = true;
            lblInputMessage.Text = "Please enter a valid Card Number.";
            return;
        }
    }

    if (isGood)
    {
        if (dtStart > dtEnd)
        {
            lblInputMessage.Visible = true;
            lblInputMessage.Text = "End Date must be greater than Start Date.";
            return;
        }

        lblInputMessage.Visible = false;
        LoadGridData(true);
        ajaxCollapsiblePanel1.Collapsed = true;
        ajaxCollapsiblePanel1.ClientState = "true";
        pnlContainer.Visible = true;
    }

    else
    {
        lblInputMessage.Visible = true;
        lblInputMessage.Text = "Please enter a valid date.";
        return;
    }
}

Answer 1

您可以修改它以使用 IDataErrorInfo 并执行类似这样的操作。

public string Error
{
    get { return String.Empty; }
}

public string this[string columnName]
{
    get
    {
        String errorMessage = String.Empty;
        switch (columnName)
        {
            case "Variable1":
                if (String.IsNullOrEmpty(Variable1))
                {
                    errorMessage = "Variable1 is required";
                }
                break;
            case "Variable2":
                if (Variable2 < 10)
                {
                    errorMessage = "Variable2 can't be less than 10";
                }
                break;
        }
        return errorMessage;
    }
}

本教程https://tarundotnet.wordpress.com/2011/03/03/wpf-tutorial-how-to-use-idataerrorinfo-in-wpf/涵盖基础知识。