输入的字符串格式不正确?为什么 [英] input string was not in correct format? why

问题描述

有人知道吗?

输入的字符串格式不正确?为什么

Can Anyone know?

input string was not in correct format? why

public float getshipping(string deliveryarea)
    {
        SqlCommand cmd3 = new SqlCommand("select shipping from delivery where status='A' and area='" + deliveryarea + "'", con);
        SqlDataReader dr3 = cmd3.ExecuteReader();
        while (dr3.Read())
        {
            shiping = float.Parse(dr3[0].ToString());//error
        }
        dr3.Close();
        return shiping;
    }

推荐答案

为什么不尝试使用Convert.ToDouble而不是float.parse

why don''t you try Convert.ToDouble instead of float.parse

确保dr3 [0]可以返回float ?，如果不是，请使用try parse代替float.parse，


希望对您有帮助，

谢谢

are you sure that dr3[0] can return float?, if it''s not the use try parse instead of float.parse,


hope it helps,

thanks

尝试一下:

try this:

float result;
float.TryParse(dr[3], out result)
{
   shipping = result;
}

这是为了检查dr [3]的值是否可以转换为float.

如果这解决了您的问题，请标记为答案

-爱德华

this is to check if the value of dr[3] is convertible to float.

Please mark as answer if this solved your problem

-Eduard

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