Application Exit Collection was modified; enumeration operation may not execute
I am getting this error Collection was modified; enumeration operation may not execute.
I have 3 forms. These are the form closing events of all 3 I did some research and learnt that some from was modified/shown inturn causing this error
Form1
private void btnExitl_Click(object sender, EventArgs e)
{
this.Close();
}
private void frmPlant_FormClosing(object sender, FormClosingEventArgs e)
{
if (DataDirty)
{
if (DialogResult.Yes == MessageBox.Show("Are you sure you want to exit", "Data Changed", MessageBoxButtons.YesNo, MessageBoxIcon.Question))
Application.Exit();
else
e.Cancel = true;
}
else
Application.Exit();
}
Form2:
private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
}
private void frmInputFiles_FormClosing(object sender, FormClosingEventArgs e) { int plantid = StaticClass.GlobalValue; //Properties.Settings.Default.PlantId = plantid;
Program.fPlant = new frmPlant(plantid);
Program.fPlant.Show();
e.Cancel = false;
//this.Hide();
}
Form3:
private void btnClose_Click(object sender, EventArgs e) { this.Close(); }
private void frmVesselData_FormClosing(object sender, FormClosingEventArgs e) {
DialogResult result;
int fileId = StaticClass.FileGlobal;
if (DataDirty)
{
string messageBoxText = "You have unsaved data. Do you want to save the changes and exit the form?";
MessageBoxButtons button = MessageBoxButtons.YesNo;
string caption = "Data Changed";
MessageBoxIcon icon = MessageBoxIcon.Question;
result = MessageBox.Show(messageBoxText, caption, button, icon);
if (result == DialogResult.No)
{
Program.fInputFiles = new frmInputFiles(gPlantId, gPlantName);
Program.fInputFiles.Show();
//e.Cancel=true;
}
if (result == DialogResult.Yes)
{
e.Cancel = true;
//return;
}
}
else
{
Program.fInputFiles = new frmInputFiles(gPlantId, gPlantName);
Program.fInputFiles.Show();
//e.Cancel = false;
}
}
It happens only when I view the third form(Form3). Form1, Form2 work well,. But if I view form3 and try to go back to form1 So somewhere in the closing event of form3, form1
My guess is the btnExit_close event of the form This.close()
Thank u
While closing your First Form try this on FormClosingEvent
private void frmPlant_FormClosing(object sender, FormClosingEventArgs e)
{
if (DataDirty)
{
if (DialogResult.Yes == MessageBox.Show("Are you sure you want to exit", "Data Changed", MessageBoxButtons.YesNo, MessageBoxIcon.Question))
{
this.Close();
Application.Exit();
}
else
e.Cancel = true;
}
else
Application.Exit();
}
Call this.Close() first and then Application.Exit(), Application.Exit() terminates all processes and Close() close your main form
只需调用Environment.Exit（0）;
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