图片和二进制间的转换

1.根据路径把图片转成二进制保存在数据库里

public bool SaveImage(string filePath)
{
bool
isSuccess = false;
string FilePath = filePath;

string filename = FilePath.Substring(FilePath.LastIndexOf("\\") + 1);
//得到上传文件的文名
string filetext = string.Empty;
FileStream fs =
new FileStream(FilePath, FileMode.OpenOrCreate, FileAccess.Read);

BinaryReader br = new BinaryReader(fs);
byte[] fileByte =
br.ReadBytes((int)fs.Length);//将流读入到字节数组中
//Byte[] fileByte = new
Byte[(int)fs.Length];
//fs.Read(fileByte, 0, fileByte.Length);

//filetext = System.Text.Encoding.Default.GetString(fileByte);
//将指定字节数组中的说有字节解码为一个字符串
SqlConnection conn = new
SqlConnection(@"server=192.168.0.173;database=SoyErp;uid=sa;pwd=sa;");

conn.Open();
StringBuilder strSql = new
StringBuilder();
strSql.Append("INSERT INTO dbo.picSaveToSql (
ImgFile) VALUES ( @Photo )");
SqlCommand cmd = new
SqlCommand(strSql.ToString(), conn);
cmd.Parameters.Add("@Photo",
SqlDbType.Binary).Value = fileByte;
isSuccess =
cmd.ExecuteNonQuery() > 0 ? true : false;
conn.Close();

fs.Close();
return isSuccess;
}

//从数据库里根据二进制转成图片

public Bitmap Get_Image()
{
byte[] imagebytes =
null;
SqlConnection conn = new
SqlConnection(@"server=192.168.0.173;database=SoyErp;uid=sa;pwd=sa;");

conn.Open();
SqlCommand com = new SqlCommand(" SELECT top 1
* FROM picSaveToSql ", conn);
SqlDataReader dr =
com.ExecuteReader();
while (dr.Read())
{

imagebytes = (byte[])dr.GetValue(0);
}

dr.Close();
conn.Close();
MemoryStream ms = new
MemoryStream(imagebytes);
Bitmap bmpt = new Bitmap(ms);

return bmpt;
}