.Net中保存和读取数据库中Image类型(二进制)字段

保存入数据库 采用参数的方式传进去

SqlCommand myCommand =

new SqlCommand(sql, new SqlConnection(Configuration.ConnectionString));

sql = @"update *** set imgicc=@imgicc where Imgfno = '" + formNo + "' and Imgwno = '" + workNo + "'";

FileInfo iccinfo = new FileInfo(hidden_imgicc.Value);

myCommand.Parameters.Add("@imgicc", SqlDbType.Image, (int)iccinfo.Length);

byte[] contenticc = new byte[iccinfo.Length];

FileStream stream = iccinfo.OpenRead();

stream.Read(contenticc, 0, contenticc.Length);

stream.Close();

myCommand.Parameters["@imgicc"].Value = contenticc;

myCommand.CommandText = sql;

myCommand.Connection.Open();

myCommand.ExecuteNonQuery();

myCommand.Connection.Close();

读取到页面 使用WriteLocalImage方法

if (dsImg.Tables[0].Rows[0]["imgiccPath"] != null)

{

WriteLocalImage(dsImg.Tables[0].Rows[0]["imgiccPath"].ToString());

}

else

{

WriteNoImg();

}

private void WriteBinaryImage(byte[] img)

{

Response.Clear();

Response.ContentType = "image/jpeg";

try

{

Response.BinaryWrite(img);

}

catch

{

WriteNoImg();

}

}

private void WriteLocalImage(string path)

{

if (path.Trim() != string.Empty)

{

Response.Clear();

Response.ContentType = "image/jpeg";

Response.TransmitFile(path);

}

else

{

WriteNoImg();

}

}

private void WriteNoImg()

{

Response.Write("Image is not exists.");

}