C# winform DevExpress上传图片

实现功能如下图：

注明：此文使用的是DevExpress控件，winform 原生控件也是一样使用方法。

1.点击选择图片按钮，功能为通过对话框选择要上传的文件，并将该文件在下面的PictureEdit中显示出来。具体代码如下：

private void btnChoosePic_Click(object sender, EventArgs e){ShowPic(pictureEdit1);}/// <summary>/// 选择图片/// </summary>/// <param name="picEdit"></param>public static void ShowPic(PictureEdit picEdit){OpenFileDialog ofd = new OpenFileDialog();ofd.InitialDirectory = @"C:\";ofd.Filter = "Image Files(*.JPG;*.PNG;*.jpeg;*.GIF;*.BMP)|*.JPG;*.PNG;*.GIF;*.BMP;*.jpeg|All files(*.*)|*.*";ofd.RestoreDirectory = true;if (ofd.ShowDialog() == DialogResult.OK){PicAddress = ofd.FileName;Image imge = Image.FromFile(PicAddress);Bitmap bm = new Bitmap(imge, picEdit.Width, picEdit.Height);picEdit.Image = bm;}}

ShowPic()方法为静态方法，可以直接调用，其中的PicAddress变量为静态全局变量，用于记录要上传文件的文件地址。PictureEdit显示图片的方式，是通过PictureEdit的image属性设定的，将图片转成Bitmap格式，位图文件是最简单的图片格式。

2.上传图片，该按钮的功能是将选定的图片上传到数据库中，具体的实现代码如下：

/// <summary>/// 上传图片/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnUploadPic_Click(object sender, EventArgs e){if (PicAddress != null){if (PicType.Equals("教师")){var sqlSearch =$@"select count(*) from studentmanager.picture where PicTypeId = '{TeacherId}'and PicType='{PicType}'";var dsSearch = _db.GetResult(sqlSearch);if (dsSearch.Tables[0].Rows[0][0].ToString().Equals("0")) //没有重复的，则进行新增插入操作{byte[] pic = CommonFunction.GetContent(PicAddress);var result = _db.SavePictureToDB(pic, PicAddress, PicType, TeacherId);if (result > 0){CommonFunction.MessageShow("头像添加成功", "提示", "OK", "Information");DialogResult = DialogResult.OK;}else{CommonFunction.MessageShow("头像添加失败");}}else{//更新头像if (PicAddress.Equals(String.Empty)){CommonFunction.MessageShow("没有重新选择图片进行更新");return;}byte[] pic = CommonFunction.GetContent(PicAddress);var result = _db.UpdatePictureToDb(pic, PicAddress, PicType, TeacherId);if (result > 0){CommonFunction.MessageShow("头像更新成功", "提示", "OK", "Information");DialogResult = DialogResult.OK;}else{CommonFunction.MessageShow("头像更新失败");}}}else if(PicType.Equals("学生")){var sqlSearch =$@"select count(*) from studentmanager.picture where PicTypeId = '{StudentId}'and PicType='{PicType}'";var dsSearch = _db.GetResult(sqlSearch);if (dsSearch.Tables[0].Rows[0][0].ToString().Equals("0")) //没有重复的，则进行新增插入操作{byte[] pic = CommonFunction.GetContent(PicAddress);var result = _db.SavePictureToDB(pic, PicAddress, PicType, StudentId);if (result > 0){CommonFunction.MessageShow("头像添加成功", "提示", "OK", "Information");DialogResult = DialogResult.OK;}else{CommonFunction.MessageShow("头像添加失败");}}else{//更新头像if (PicAddress.Equals(String.Empty)){CommonFunction.MessageShow("没有重新选择图片进行更新");return;}byte[] pic = CommonFunction.GetContent(PicAddress);var result = _db.UpdatePictureToDb(pic, PicAddress, PicType, StudentId);if (result > 0){CommonFunction.MessageShow("头像更新成功", "提示", "OK", "Information");DialogResult = DialogResult.OK;}else{CommonFunction.MessageShow("头像更新失败");}}}}else{CommonFunction.MessageShow("请先选择图片！", "提示", "OK", "Error");}}

上传的过程大概就是：根据文件地址将对应文件转换成数据流二进制格式–>编写对应的SQL语句–>执行该SQL语句，将图片添加到数据库中。
上面代码中SavePictureToDB方法代码如下：

/// <summary>/// 保存图片到数据库/// </summary>/// <param name="imageByte"></param>/// <param name="Tablename"></param>/// <param name="FieldPicturename"></param>/// <param name="FieldIdxname"></param>/// <param name="FieldIdxvalue"></param>/// <returns></returns>public int SavePictureToDB(byte[] imageByte,string Picturename,string PicType,int PicTypeId){var result = 0;try{if (imageByte != null && imageByte.Length != 0){using (var conn = new MySqlConnection()){conn.ConnectionString = ConnectionString;conn.Open();var insertStr = @"INSERT INTO studentmanager.picture (Picturename, PicType, PicTypeId, imageByte)VALUES(@Picturename, @PicType, @PicTypeId, @imageByte);";var comm = new MySqlCommand();comm.Connection = conn;comm.CommandText = insertStr;comm.CommandType = CommandType.Text;//设置数据库字段类型MediumBlob的值为图片字节数组imageBytecomm.Parameters.Add(new MySqlParameter("@imageByte", MySqlDbType.MediumBlob)).Value = imageByte;comm.Parameters.Add(new MySqlParameter("@Picturename", MySqlDbType.VarChar)).Value = Picturename;comm.Parameters.Add(new MySqlParameter("@PicType", MySqlDbType.VarChar)).Value = PicType;comm.Parameters.Add(new MySqlParameter("@PicTypeId", MySqlDbType.Int32)).Value = PicTypeId;//execute sqlresult = comm.ExecuteNonQuery();comm.Dispose();conn.Close();conn.Dispose();}}}catch (Exception){// throw ex;}return result;}

3.加载图片显示到PictureEdit；

/// <summary>/// 窗口加载/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void HeadManager_Load(object sender, EventArgs e){LoadImage(PicType, PicType.Equals("教师") ? TeacherId : StudentId);}/// <summary>/// 获取图片/// </summary>/// <param name="picType"></param>/// <param name="picTypeid"></param>private void LoadImage(string picType, int picTypeid){try{var imageBytes = _db.GetImage(picType, picTypeid);var image = CommonFunction.GetImageByBytes(imageBytes);Bitmap bm = new Bitmap(image, pictureEdit1.Width, pictureEdit1.Height);pictureEdit1.Image = bm;}catch (Exception){pictureEdit1.Image = Resource.DefaultUser;}}

4.用到的公共方法：

/// <summary>/// 转换为Byte[]/// </summary>/// <param name="filepath"></param>/// <returns></returns>public static byte[] GetContent(string filepath)//将指定路径下的文件转换成二进制代码，用于传输到数据库{FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);byte[] byData = new byte[fs.Length];//新建用于保存文件流的字节数组fs.Read(byData, 0, byData.Length);//读取文件流fs.Close();return byData;}/// <summary>/// 读取byte[]并转化为图片/// </summary>/// <param name="bytes">byte[]</param>/// <returns>Image</returns>public static Image GetImageByBytes(byte[] bytes){Image photo;using (MemoryStream ms = new MemoryStream(bytes)){ms.Write(bytes, 0, bytes.Length);photo = Image.FromStream(ms, true);ms.Dispose();ms.Close();}return photo;}

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