Argumentexception是未处理的参数在C＃中无效 [英] Argumentexception was unhandled parameter not valid in C#

问题描述

嗨朋友们，



我在postgres数据库中保存了一张图片。



当我想要在图片框中检索图像我收到此错误ArgumentException未处理参数无效。我已经粘贴了我的编码。



我尝试了什么：



我已经尝试过互联网上的各种解决方案，但我无法解决这个问题。

请告诉我哪里出错了。

Hi friends,

I have saved an image in my postgres database.

when i want to retrieve the image back in the picture box i am getting this error ArgumentException was unhandled Parameter not valid. i have pasted my codings.

What I have tried:

I have tried all sorts of solutions from internet but i could not solve this.
Please tell me where i have gone wrong.

public Image byteArrayToImage(byte[] byteArrayIn)
{
    MemoryStream ms = new MemoryStream(byteArrayIn); 
    Image returnImage = Image.FromStream(ms);
    return returnImage;

}

byte[] photo = System.Text.Encoding.Unicode.GetBytes(dr2["customerimage"].ToString());
pictureBox2.Image = byteArrayToImage(photo);

推荐答案

简单：这可能是你如何保存它导致问题：为什么我会得到一个参数无效。我从数据库中读取图像时出现异常？ [ ^ ]

Simple: it's probably how you saved it that is causing the problem: Why do I get a "Parameter is not valid." exception when I read an image from my database?[^]

这样的事情：

Something like this:

command = new NpgsqlCommand("select customerimage from mytable where id = 1);", conn);
Byte[] result = (Byte[])command.ExecuteScalar();

FileStream fs = new FileStream("database", FileMode.Create, FileAccess.Write);
BinaryWriter bw = new BinaryWriter(new BufferedStream(fs));

bw.Write(result);
bw.Flush();
fs.Close();
bw.Close();

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