C# 图片或PDF保存到SQL Server数据库

数据库字段如下：图片保存要用image数据类型

保存到数据库的两种方式：

 // 打开文件，获取图片路径OpenFileDialog openFileDialog = new OpenFileDialog();if (openFileDialog.ShowDialog() == DialogResult.Cancel){return;}//pictureBox1.Image = Image.FromFile(openFileDialog.FileName);FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);//通过BinaryReader类对象的ReadBytes()方法将FileStream类对象转化为二进制数组BinaryReader br = new BinaryReader(fs);byte[] img = br.ReadBytes(Convert.ToInt32(fs.Length));// 方法一：通过参数的形式直接用Sql语句保存string insert = "insert into T_Img(ID,Img) values(@ID,@Img)";SqlParameter[] parameter = new SqlParameter[]{new SqlParameter("@ID", Convert.ToInt32(textBox1.Text)),new SqlParameter("@Img", img)};db.ExcuteBySqlParmeter(insert, parameter);// 方法二：使用SqlBulkCopystring sql = "select top 0 * from T_Img";DataSet ds = db.LoadDataSetBySql(sql);DataTable dtImg = ds.Tables[0];DataRow dr = dtImg.NewRow();dr["ID"] = Convert.ToInt32(textBox1.Text);dr["Img"] = img;dtImg.Rows.Add(dr);db.SaveImg(dtImg, "T_Img");

上面的ExcuteBySqlParmeter()和SaveImg()方法的详细代码如下：

public int ExcuteBySqlParmeter(string sql, SqlParameter[] sqlParmeter)
{int ir = 0;try{// GetConn()：获取一个SqlConnection对象SqlCommand comm = new SqlCommand(sql, GetConn());comm.Parameters.AddRange(sqlParmeter);ir = comm.ExecuteNonQuery();CloseConn();}catch{ir = 0;}return ir;
}public int SaveImg(DataTable dataTable, string TableName)
{int ir;try{SqlBulkCopy bulkCopy = new SqlBulkCopy(GetConn());  bulkCopy.DestinationTableName = TableName;//设置目标表的名称bulkCopy.WriteToServer(dataTable);  //保存ir = 1;}catch{ir = 0;}return ir;
}

从数据库读取图片并显示

private void GetImg()
{string sql = $"select top 1 * from T_Img where ID = {textBox1.Text}";DataSet ds = db.LoadDataSetBySql(sql);DataRow dr = ds.Tables[0].Rows[0];byte[] bytes = (byte[])dr["Img"];MemoryStream ms = new MemoryStream(bytes);this.pictureBox2.Image = Image.FromStream(ms);
}