遇到一些bool/string问题 [英] Having trouble with some bool/string issues

问题描述

我有一些像这样打开的代码:

I've got some code-behind that opens like this:

namespace MyNamespace
{
    public partial class _Default : Page
    {
        public DropDownList DDL_Reporting_RunForDaily;
        public bool _retrievedData = false;

我想在会话变量中使用_retrieveData，因此我从一开始就将其设置为false.现在，我有一个"protected void"，我想在其中更改此变量的值，因此我在使用以下行:

I want to use _retrieveData in a session variable, so I'm setting it to false from the start. Now, I have a "protected void" where I want to change the value of this variable, so I'm using the line:

Session["_retrievedData"] = true;

最后，在另一个公共无效空间"中，我要检查会话变量的值，并且仅在该值设置为false时才运行它.所以，我有了代码:

Lastly, in another "public void" I want to check the value of the session variable and only run it if the value is set to false. So, I've got the code:

bool CanRun = (bool)Session["_retrievedData"];
if (CanRun == true)
{
    CanRun = false;
    return;
}

我的问题是，最后一段代码出现以下错误:

My problem is, I'm getting the following errors with that last piece of code:

• 无法将类型'bool'隐式转换为'string'
• 运算符'=='不能应用于类型为'string'的操作数，并且 '布尔'

• Cannot implicitly convert type 'bool' to 'string'
• Operator '==' cannot be applied to operands of type 'string' and 'bool'

我为什么会遇到这些错误的任何想法?当我尝试将"=="更改为"="时，出现错误消息:

Any ideas why I'm getting those errors? When I tried changing the "==" to "=", I got an error that said:

• 条件表达式中的赋值始终是常量；你的意思 使用==代替=?

• Assignment in conditional expression is always constant; did you mean to use == instead of = ?

推荐答案

我对Session对象并不十分熟悉. 但是对我来说，索引器似乎返回一个字符串. 试试这个: bool CanRun = Boolean.Parse( Session["_retrievedData"] );

I'm not terribly familiar with the Session object. But to me it seems that the indexer returns a string. Try this: bool CanRun = Boolean.Parse( Session["_retrievedData"] );

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