string未被识别为有效的布尔值。 asp.net c＃ [英] string was not recognized as a valid boolean. asp.net c#

问题描述

嗨......

我在匹配数据库中的用户电子邮件和密码时遇到错误。实际上我想检查用户的电子邮件soo我从数据库中获取数据表，现在检查包含1或2的字段user_typeid，但当我转换为布尔类型时，错误发生字符串未被识别为有效布尔。代码如...

Hi...
i am facing an error while matching the user email and password from database. Actually i want to check the velidation of users email soo i fetch the datatable from database and now checking the field "user_typeid" which contains 1 or 2 but when i convert into boolean type veriable the error occured as "string was not recognized as a valid boolean". the code is as...

protected void Button1_Click(object sender, EventArgs e)
    {
        DataTable dt = new DataTable();
        dt = getdata();

        if (dt.Rows.Count > 0)
        {
//in this statment error occures-->// Boolean bol=Convert.ToBoolean( dt.Rows[0]["activated"]);

            if(bol==true)
            {
               bool utype=Convert.ToBoolean( dt.Rows[0]["user_typeid"]);
                if(utype==true)
                {
                    bool delate=Convert.ToBoolean( dt.Rows[0]["delated"]);
                if(delate==true || delate==null)
                {
                    string user=Convert.ToString(dt.Rows[0]["user_name"]);
                    Session["username"] = user;
                    Response.Redirect("view.aspx");
                }
                else
                {
                Response.Write("You are blocked by admin");
                }

                }
                else
                {
                Response.Write("You are not authorized to login from hare");
                }
            }
            else
            {
                Response.Write("Yor are not a verified user");
            }    
        }
        else
        {
            Response.Write("User not exists");
        }
    }

plz任何人帮助我在asp新手。净。我将感谢你

plz anybody help me m new in asp.net. i will be thankfull to you

推荐答案

Convert.ToBoolean不能将随机值转换为 bool - 只有值它理解。

在这种情况下，你想转换一个整数 - 所以给它一个整数：

Convert.ToBoolean cannot convert "random" values to bool - only values it understands.
In this case, you want to convert an integer - so give it an integer:

bool utype=Convert.ToBoolean((int) dt.Rows[0]["user_typeid"]);

Zero将转换为false，其他所有都为true。

http： //msdn.microsoft.com/en-us/library/h0b8dwce.aspx [ ^ ]

我将boolean的类型更改为int32 soo我的问题解决了..

i changed the type of boolean into int32 soo my problem is solved..

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