private void Button1Click(object sender, RoutedEventArgs e)
{
// Ready to add new row
switch (button1.Content.ToString()) {
case "Add": {
button1.Content = "New";
var student = new StudentDTO {
Avg = float.Parse(tbAvg.Text),
Birthday = DateTime.Parse(dpBirthday.Text),
Code = tbCode.Text,
Name = tbName.Text,
Status = true,
};
StudentController.Create(student, _imageFile);
_dataSource.Add(student);
}
break;
case "New":
button1.Content = "Add";
button1.IsEnabled = false;
tbName.Text = "Name";
tbCode.Text = "Student Code";
tbAvg.Text = "Average Mark";
dpBirthday.Text = "Birthday";
break;
}
}
public static string Update(StudentDTO dto, string imageFile)
{
var request = WebRequest.Create(ServiceURL + "students/update") as HttpWebRequest;
return GetPostResult(dto,request, imageFile);
}
public static string Delete(StudentDTO dto)
{
// TODO: Change to normal get for better performance
var request = WebRequest.Create(ServiceURL + "students/" + dto.Id + "/delete") as HttpWebRequest;
return GetPostResult(dto,request, null);
}
private static string PostOtherData(StudentDTO dto, HttpWebRequest request)
{
if (request != null) {
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentType = "application/json";
}
// Create a byte array of the data we want to send
var byteData = Encoding.UTF8.GetBytes(
"{'Id' : '" + dto.Id + "','Name' : '" + dto.Name + "', 'Status' : '" + dto.Status + "', 'Code': '" + dto.Code +
"', 'Avg' : " + dto.Avg + ", 'Birthday' : '" + dto.Birthday + "'}"
);
// Set the content length in the request headers
request.ContentLength = byteData.Length;
// Write data
using (var postStream = request.GetRequestStream())
postStream.Write(byteData, 0, byteData.Length);
// Get response
string result;
try {
using (var response = request.GetResponse() as HttpWebResponse)
result = new StreamReader(response.GetResponseStream()).ReadToEnd();
}
catch {
result = "failed";
}
return result;
}
private static void PostImage(StudentDTO dto, string filePath)
{
var request = (HttpWebRequest)WebRequest.Create(ServiceURL + "students/upload/" + dto.Name);
request.Accept = "text/xml";
request.Method = "POST";
request.ContentType = "image/jpeg";
using (var fileStream = File.OpenRead(filePath))
using (var requestStream = request.GetRequestStream()) {
var buffer = new byte[1024];
int byteCount;
while ((byteCount = fileStream.Read(buffer, 0, 1024)) > 0) {
requestStream.Write(buffer, 0, byteCount);
}
}
string result;
try
{
var response = request.GetResponse();
using (var reader = new StreamReader(response.GetResponseStream()))
{
result = reader.ReadToEnd();
}
}
catch (Exception exception) {
MessageBox.Show("Your image size is too big !");
}
}
private static string GetPostResult(StudentDTO dto, HttpWebRequest request, string imageFileAddress)
{
// Upload image to server
PostImage(dto, imageFileAddress);
// Set type to POST
var result = PostOtherData(dto, request);
return result;
}
// Update
private void Button2Click(object sender, RoutedEventArgs e)
{
var selectedStudent = (StudentDTO) studentGrid.SelectedItems[0];
var index = studentGrid.SelectedIndex;
var student = new StudentDTO {
Avg = float.Parse(tbAvg.Text),
Birthday = DateTime.Parse(dpBirthday.Text),
Code = tbCode.Text,
Name = tbName.Text,
Status = true,
Id = selectedStudent.Id
};
if (StudentController.Update(student, _imageFile) == "failed") {
MessageBox.Show("Update failed");
} else {
_dataSource[index] = student;
}
}
