将数据库中的图像数据读取到图片框中时出错 [英] error in reading image data from database into a picture box

问题描述

将图像类型数据导入图片框时出现问题
我已经创建了一个表格
tbl_items
具有属性

i have a problem in importing the image type data into a picture box
i have created a table
tbl_items
with attribute

item_image [image],<br />

我直接将图片保存到该属性
但我在将图像取回图片框时遇到问题

我的代码是

i saved the image directly to that attribute
but i have problem in retriving the image back to the picture box

my code is

public void Fload()
        {
            DataTable dt = Bllsqlhelper.getImagebyImageid(Convert.ToInt32(cmb_Jname.SelectedIndex));
            if (dt.Rows.Count > 0)
            {
               // if ((byte[])(dt.Rows[0][0]) == null) { }
              //  else
                {
                    byte[] imageData = (byte[])(dt.Rows[0][10]);
                    Image newImage;
                    //Read image data into a memory stream
                    using (MemoryStream ms = new MemoryStream(imageData, 0, imageData.Length))
                    {
                        ms.Write(imageData, 0, imageData.Length);

                        //Set image variable value using memory stream.
                        newImage = Image.FromStream(ms,true);
                        
                    }
                    pic0.Image = newImage;
                }
            }
        }

问题在行

ploblem is shown in line

newImage= Image.FromStream(ms,true);<br />

中显示 错误是参数无效
我无法调试问题

请帮助我


谢谢你
Aliza

the error is parameter not valid
i could not debug the problem

pleaase help me


thank u
Aliza

推荐答案

这是一个问题:您写入流，并立即尝试通过FromStream进行读取，但是流位置在最后.请执行以下操作:不要写入流；您已经有数据.使用不同的构造函数来创建不可调整大小的流MemoryStream(byte[])，并从中读取数据.请参阅 http://msdn.microsoft.com/en-us/library/system.io .memorystream.aspx [ ^ ].

—SA

Here is a problem: you write to stream and immediately try to read via FromStream, but the stream position is at the end. Do the following: do not write to the stream; you already have data. Use different constructor to create a non-resizeable stream, MemoryStream(byte[]) and just read from it. See http://msdn.microsoft.com/en-us/library/system.io.memorystream.aspx[^].

—SA

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