asp.net中上传图片文件实现防伪图片水印并写入数据库

// 涉及命名空间
using system;
using system.collections;
using system.componentmodel;
using system.data;
using system.data.sqlclient;
using system.drawing;
using system.drawing.drawing2d;
using system.drawing.imaging;
using system.web;
using system.configuration;

// 方法
public void adduser(string personname, string personemail, string personsex, string persondob, string personimage, string personimagetype)
{
string strimagetype = userimage.postedfile.contenttype;
stream imagestream = userimage.postedfile.inputstream;

// 加水印----------------->
string wimagefile = server.mappath("/bkwww/image/homesign.gif"); // 要加的水印图
image simage = image.fromstream(imagestream); // 从 http 输入流创建 image
image wimage = image.fromfile(wimagefile);

// 绘图
graphics g = graphics.fromimage(simage);
g.drawimage(wimage, new rectangle(0, 0, wimage.width, wimage.height), 0, 0, wimage.width, wimage.height, graphicsunit.pixel);

// 保存，并将 image 转化为 byte[]
memorystream ms=new memorystream();
byte[] myimage=null;
simage.save(ms, imageformat.gif);
myimage = ms.getbuffer();
//------------------------>



// 写入数据库
string strconn = configurationsettings.appsettings["connectionstring"];
sqlconnection myconnection = new sqlconnection(strconn);
sqlcommand mycommand = new sqlcommand("sp_person_isp", myconnection);
mycommand.commandtype = commandtype.storedprocedure;

mycommand.parameters.add("@personemail", sqldbtype.varchar, 255).value = personemail;
mycommand.parameters.add("@personname", sqldbtype.varchar, 255).value = personname;
mycommand.parameters.add("@personsex", sqldbtype.char, 1);
if(sexmale.checked)
mycommand.parameters["@personsex"].value = "m";
else
mycommand.parameters["@personsex"].value = "f";
mycommand.parameters.add("@persondob", sqldbtype.datetime).value = persondob;
mycommand.parameters.add("@personimage", sqldbtype.image).value = myimage;
mycommand.parameters.add("@personimagetype", sqldbtype.varchar, 255).value = imagetype;

try
{
myconnection.open();
mycommand.executenonquery();
myconnection.close();
response.write("添加成功！");
}
catch(system.exception sqlex)
{
response.write("添加失败！"+sqlex.tostring());
}
}