我可以使用反射通过提供其名字来获得一个现有的变量？ [英] Can I use reflection to get an existing variable by providing its name?

问题描述

我接手别人的工作，有很多重复的code的。现在，我只是想更改以下code：（在code我想改变为code的此块之后）

I'm taking over somebody's work and there is a lot of duplicated code. For now, I just want to change the following code: (the code I wanted to change is after this block of code)

        if (Session["opt3PSRAddHrs4"] != null)
        {
            lblDay4AddHrs.Text = "Additional Hours: " + (String)Session["opt3PSRAddHrs4"];
        }
        else
        {
            lblDay4AddHrs.Visible = false;
        }



        if (Session["opt3PSRAddHrs5"] != null)
        {
            lblDay5AddHrs.Text = "Additional Hours: " + (String)Session["opt3PSRAddHrs5"];
        }
        else
        {
            lblDay5AddHrs.Visible = false;
        }

        if (Session["opt3PSRAddHrs6"] != null)
        {
            lblDay6AddHrs.Text = "Additional Hours: " + (String)Session["opt3PSRAddHrs6"];
        }
        else
        {
            lblDay6AddHrs.Visible = false;
        }

        if (Session["opt3PSRAddHrs7"] != null)
        {
            lblDay7AddHrs.Text = "Additional Hours: " + (String)Session["opt3PSRAddHrs7"];
        }
        else
        {
            lblDay7AddHrs.Visible = false;
        }

到

for (int i = 0; i < 7; i++) {

   Label label = Reflection.getVariable(type = "Label", name = "lblDay" + i + "AddHrs");
   string sessionData = (string) Session["opt3PSRAddHrs" + i];
   if ( sessionData != null) {
      label.Text = "Additional Hours: " + sessionData;
   }
   else {
      label.Visible = false;
   }
}

使用反射。由于这些标签的名称遵循一个模式，可以反射帮助？

using reflection. Since the name of those labels follow a pattern, can reflection help?

（顺便说一句，也许把所有的东西opt3PSRAddHrs在数组中是个好主意，但你知道，现在我不想改变code的那部分......每一个改变都可能会离开不一致.. 。）

(BTW, perhaps putting all opt3PSRAddHrs stuff in an array is a good idea, but you know, for now I don't want to change that part of code... Every change will probably leave inconsistency...)

推荐答案

反思是不是答案。您应该使用 Page.FindControl 方法，而不是

Reflection isn't the answer. You should use the Page.FindControl method instead.

要在页面级别，你会发现使用一个标签：

To find a label at the page level you would use:

Label label = (Label)FindControl("lblDay" + i + "AddHrs");

请注意，你需要使用它持有的标签在容器上。例如，如果一个面板与 ID =myPanel存在于您的标签你可以使用 myPanel.FindControl（...）。

Note that you'll need to use it on the container which holds your labels. For example, if your labels exist within a Panel with ID="myPanel" you would use myPanel.FindControl(...).

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