13.02.04 C# Linq 添加、修改 带有richTextBox格式的内容到数据库

修改
//db.RTUs.AsEnumerable().ElementAt(listBox_rtu.SelectedIndex).RTU_ID = textBox_rtuID.Text;
//db.RTUs.AsEnumerable().ElementAt(listBox_rtu.SelectedIndex).X = Convert.ToInt32(textBox_PosX.Text);
//db.RTUs.AsEnumerable().ElementAt(listBox_rtu.SelectedIndex).Y = Convert.ToInt32(textBox_PosY.Text);
//db.RTUs.AsEnumerable().ElementAt(listBox_rtu.SelectedIndex).GPRS_ID = textBox_PosX.Text;

//var stream = new System.IO.MemoryStream();
//richTextBox_rtuDescription.SaveFile(stream, RichTextBoxStreamType.RichText);
//stream.WriteByte(13);
//byte[] buffer = stream.GetBuffer();
//db.RTUs.AsEnumerable().ElementAt(listBox_rtu.SelectedIndex).rtf = buffer;

//
//先删除，
//
var rs = from rtu in db.RTUs
where rtu.RTU_ID == listBox_rtu.SelectedItem.ToString()
select rtu;
db.RTUs.DeleteAllOnSubmit(rs);
db.SubmitChanges();

//
//再添加
//
RTUs newrtu = new RTUs();
newrtu.RTU_ID = textBox_rtuID.Text;
newrtu.X = Convert.ToInt32(textBox_PosX.Text);
newrtu.Y = Convert.ToInt32(textBox_PosY.Text);
newrtu.GPRS_ID = textBox_gprsNum.Text;
var stream = new System.IO.MemoryStream();
richTextBox_rtuDescription.SaveFile(stream, RichTextBoxStreamType.RichText);
stream.WriteByte(13);
byte[] buffer = stream.GetBuffer();
newrtu.rtf = buffer;
db.RTUs.InsertOnSubmit(newrtu);

db.SubmitChanges();

var results = from r in db.RTUs
where r.RTU_ID == listBox_rtu.SelectedItem.ToString()
select r;
db.RTUs.DeleteAllOnSubmit(results);
db.SubmitChanges();

RTUs newRtu = new RTUs();

newRtu.RTU_ID = textBox_rtuID.Text;
newRtu.X = Convert.ToInt32(textBox_PosX.Text);
newRtu.Y = Convert.ToInt32(textBox_PosY.Text);
newRtu.GPRS_ID = textBox_PosX.Text;

var stream = new System.IO.MemoryStream();
richTextBox_rtuDescription.SaveFile(stream, RichTextBoxStreamType.RichText);
stream.WriteByte(13);
byte[] buffer = stream.GetBuffer();
newRtu.rtf = buffer;

db.RTUs.InsertOnSubmit(newRtu);
db.SubmitChanges();