如何将字符串转换为布尔值 [英] how to convert string to boolean

问题描述

任何人都可以更正以下代码:


错误代码:

Can Anyone correct the following code:


Error code:

protected void BulletedList3_Click(object sender, BulletedListEventArgs e)
    {
        ListItem li = BulletedList3.Items[e.Index];
        string price = li.ToString();
        price_range = BulletedList3.Items[e.Index].Value;
        if (con.State == ConnectionState.Closed)
        {
            con.Open();
        }
        switch (price_range)
        {
            case "Below Rs.500/-":
                condition = "<500";
                break;
            //case "Rs.500/- to Rs.1000/-":
               
            //    break;
            //case "Rs.1000/- To Rs.2000/-":
                
            //    break;
            default:
                break;
        }
        con.Close();
        price1();
    }
    public void price1()
    {
        if(Convert.ToBoolean(price_range  == "<500"))
        {
            SqlCommand cmd = new SqlCommand("select pro_name,pro_img,price from product where status=''A''and type=''retail''", con);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        DataList1.DataSource = ds;
        DataList1.DataBind();
        con.Close(); 
            }

    }

推荐答案

您要回答以下哪些问题-此问题或

Which of these questions do you want answered - this one or this one[^]?
What do you want corrected in this code?

Your string to boolean conversion looks ok here.

此代码

if(Convert.ToBoolean(price_range  == "<500"))

不管用.阅读此 Convert.ToBoolean方法(字符串) [

will not work. Read this Convert.ToBoolean Method (String)[^]
Instead you will need to do something like the following

if (price_range <= 500)

我只是注意到price_range是一个字符串?如果是这样，您尝试做的只是很奇怪，我建议您重新考虑您的设计.

好吧，我想你可以做这样的事情

I just noticed that price_range is a string?? If so what you are trying to do is just weird and I recommend you to rethink your design.

Well I guess you could do something like this

string price_range = "Below Rs.500/-";
string[] priceRange = price_range.Split(new char[] { '.', '/' });
if (Int32.Parse(priceRange[1]) <= 500)
{
}

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