private void EditCurrentData()
{
TeacherContainer dataContainer = ReadCurrentData();
if (dataContainer == null || dataContainer.Teachers.Count == 0)
{
return;
}
List <Teacher> teachers = dataContainer.Teachers;
ShowPrompt("Select ID of the teacher you wish to edit?", "cyan");
bool continueEdit = true;
int selectedId = -1;
string selectedIdStr = "";
do
{
try
{
selectedIdStr = Console.ReadLine();
int.TryParse(selectedIdStr, out selectedId);
Teacher teacher = TryFetchTeacher(teachers, selectedId);
//ShowPrompt("Editing here");
Teacher newTeacherObj = WriteTeacher();
teacher.Name = newTeacherObj.Name;
teacher.TeacherClass = newTeacherObj.TeacherClass;
teacher.Section = newTeacherObj.Section;
_dbOp.OpenEdit(dataContainer);
continueEdit = ShowContinuePrompt();
}
catch (Exception _)
{
ShowPrompt($"No teacher records with Id: {selectedIdStr}", "red");
}
if (continueEdit)
{
ShowPrompt("Select ID of the teacher you wish to edit?", "cyan");
ShowPrompt(string.Join <Teacher>("\n", teachers.ToArray()));
}
}while (continueEdit);
}
private TeacherContainer ReadCurrentData()
{
try
{
TeacherContainer dataContainer = _dbOp.OpenRead();
ShowPrompt("\nTeachers\' Data:");
ShowPrompt(string.Join <Teacher>("\n", dataContainer.Teachers.ToArray()) + "\n");
return(dataContainer);
}
catch (Exception e)
{
ShowPrompt($"{e.Message}", "red");
}
return(null);
}
public void OpenEdit(TeacherContainer dataContainer)
{
try
{
using (_fs = new FileStream(_filepath, FileMode.Create, FileAccess.Write))
{
#pragma warning disable SYSLIB0011
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(_fs, dataContainer);
}
}
catch (IOException e)
{
//Console.WriteLine($"Exception Occured while writing edit: {e.Message}");
}
}
public TeacherContainer OpenRead()
{
try
{
using (_fs = new FileStream(_filepath, FileMode.Open))
{
#pragma warning disable SYSLIB0011
BinaryFormatter formatter = new BinaryFormatter();
TeacherContainer data = (TeacherContainer)formatter.Deserialize(_fs);
return(data);
}
}
catch (IOException _)
{
//Console.WriteLine($"Exception Occured while reading: {e.Message}");
throw new FileNotFoundException("Operation Failed, No teacher records");
}
}
public void WriteAppend(Teacher data)
{
bool noRecords = false;
TeacherContainer dataContainer = null;
try
{
dataContainer = OpenRead();
data.Id = dataContainer.CurrentId;
dataContainer.CurrentId = dataContainer.CurrentId + 1;
dataContainer.Teachers.Add(data);
}
catch (FileNotFoundException _)
{
noRecords = true;
}
try
{
if (noRecords)
{
dataContainer = TeacherContainer.Instance;
data.Id = dataContainer.CurrentId;
dataContainer.CurrentId = dataContainer.CurrentId + 1;
dataContainer.Teachers.Add(data);
}
using (_fs = new FileStream(_filepath, FileMode.Create, FileAccess.Write))
{
#pragma warning disable SYSLIB0011
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(_fs, dataContainer);
}
}
catch (IOException _)
{
//Console.WriteLine($"Exception Occured while writing: {e.Message}");
throw new Exception("Failed to write");
}
}
