通用的将文件读取为二进制方法
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(fs);
byte[] fileArray = r.ReadBytes((int)fs.Length);
fs.Dispose();
下面介绍C#实现文件与二进制互转并存入数据库
//把文件转成二进制流出入数据库
FileStream fs = new FileStream(textBox1.Text, FileMode.Open); BinaryReader br = new BinaryReader(fs); Byte[] byData = br.ReadBytes((int)fs.Length); fs.Close(); string conn = "server=.;database=testDB;Uid=sa;Pwd=sa "; SqlConnection myconn = new SqlConnection(conn); myconn.Open(); string str = "insert into pro_table (pro_name,pro_file) values(‘测试文件‘,@file)"; SqlCommand mycomm = new SqlCommand(str, myconn); mycomm.Parameters.Add("@file", SqlDbType.Binary, byData.Length); mycomm.Parameters["@file"].Value = byData; mycomm.ExecuteNonQuery(); myconn.Close(); //从数据库中把二进制流读出写入还原成文件
string conn = "server=.;database=testDB;Uid=sa;Pwd=sa "; string str = "select pro_file from pro_table where pro_name=‘测试文件‘ "; SqlConnection myconn = new SqlConnection(conn); SqlDataAdapter sda = new SqlDataAdapter(str, conn); DataSet myds = new DataSet(); myconn.Open(); sda.Fill(myds); myconn.Close(); Byte[] Files = (Byte[])myds.Tables[0].Rows[0]["pro_file"]; BinaryWriter bw = new BinaryWriter(File.Open("D:\\2.rdlc",FileMode.OpenOrCreate)); bw.Write(Files); bw.Close(); 原文：https://www.cnblogs.com/jxxlz/p/14862255.html