[英]C# Open form using generics?
我有一個帶有菜單的主窗體,該菜單包含很多項目,這些項目又打開了不同的窗體。 目前,我執行以下操作以打開特定表格:
if (canShowCustomerForm)
new CustomerForm().ShowDialog(this);
else
{
MessageBox.Show("You don't have enough rights to view this form.");
}
有沒有一種方法可以在類中移動此代碼,然后傳遞表單類型和布爾參數,而不是為每個菜單項重復代碼?
public static class FormHelper
{
public static DisplayResult ShowForm<T>(IWin32Window owner, bool canShowForm)
where T : Form, new()
{
if (canShowForm)
{
using (T form = new T())
{
return form.ShowDialog(owner);
}
}
else
{
MessageBox.Show("You don't have enough rights to view this form.");
}
}
}
您可以將其提取到如下所示的函數中,而不是一遍又一遍地編寫相同的邏輯:
void ShowFormIfAllowed<TForm>(bool allowed) where TForm : Form, new() {
if (allowed) {
using (var form = new TForm()) {
form.ShowDialog(this);
}
}
else {
MessageBox.Show("You don't have enough rights to view this form.");
}
}
然后,您可以在菜單處理中將其命名為:
ShowFormIfAllowed<CustomerForm>(canShowCustomerForm);
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