英文:
Replace items in list for items from FirebaseDatabase data
问题
我可以帮你翻译以下代码部分：
原文：
var GetItems = (await fc
.Child("Verhaal")
.OnceAsync<StudentModel>()).Select(item => new StudentModel
{
Adres = item.Object.Adres,
Plaats = item.Object.Plaats
}).ToList(); // had to add this .ToList() to make the answer from Jessie to work.
// Change it in to this
StudentModel obj = new StudentModel();
obj.Adres = "test@gmail.com";
obj.Plaats = "Test1";
_allStudentList.Add(obj);
翻译后：
var GetItems = (await fc
.Child("Verhaal")
.OnceAsync<StudentModel>()).Select(item => new StudentModel
{
Adres = item.Object.Adres,
Plaats = item.Object.Plaats
}).ToList(); // 不得不添加 .ToList() 以使 Jessie 的答案有效。
// 更改为以下内容
StudentModel obj = new StudentModel();
obj.Adres = "test@gmail.com";
obj.Plaats = "Test1";
_allStudentList.Add(obj);
英文:
Found a project that loads items in a CollectionView from a ViewModel for InfiniteScrolling.
But i want to replace the items with data from a FirebaseDatabase.
How do i make this work ?
There are 25 items in the ViewModel in AddStudentInfo()
private async void AddStudentInfo()
{
StudentModel obj = new StudentModel();
obj.Plaats = "Test1";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test2";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test3";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test4";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test5";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test6";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test7";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test8";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test9";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test10";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test11";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test12";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test13";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test14";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test15";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test16";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test17";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test18";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test19";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test20";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test21";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test22";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test23";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test24";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
obj = new StudentModel();
obj.Plaats = "Test25";
obj.Adres = "test@gmail.com";
_allStudentList.Add(obj);
}
I can load data with this from a FirebaseDatabase.
var GetItems = (await fc
.Child("Verhaal")
.OnceAsync<StudentModel>()).Select(item => new StudentModel
{
Adres = item.Object.Adres,
Plaats = item.Object.Plaats
}).ToList(); // had to add this .ToList() to make the answer from Jessie to work.
What do i have to change to make this work. Items from Adres to obj.Adres etc.
var GetItems = (await fc
.Child("Verhaal")
.OnceAsync<StudentModel>()).Select(item => new StudentModel
{
Adres = item.Object.Adres,
Plaats = item.Object.Plaats
}).ToList(); // had to add this .ToList() to make the answer from Jessie to work.
// Change it in to this
StudentModel obj = new StudentModel();
obj.Adres = "test@gmail.com";
obj.Plaats = "Test1";
_allStudentList.Add(obj);
答案1
得分: 1
你可以尝试使用async-await来实现这个。
请参考以下的代码：
public ObservableCollection<StudentModel> AllStudentList { get; set; }
AllStudentList = new ObservableCollection<StudentModel>();
private async void LoadData()
{
AllStudentList = new ObservableCollection<StudentModel>();
//GetItems 应该是一个列表
var GetItems = (await fc
.Child("Verhaal")
.OnceAsync<StudentModel>()).Select(item => new StudentModel
{
Adres = item.Object.Adres,
Plaats = item.Object.Plaats
});
foreach (var item in GetItems) {
AllStudentList.Add(item);
}
}
希望对你有帮助。
英文:
You can try to use async-await to achieve this.
Please refer to the following code:
public ObservableCollection<StudentModel> AllStudentList { get; set; }
AllStudentList = new ObservableCollection<StudentModel>();
private async void LoadData()
{
AllStudentList = new ObservableCollection<StudentModel>();
//GetItems should be a list
var GetItems = (await fc
.Child("Verhaal")
.OnceAsync<StudentModel>()).Select(item => new StudentModel
{
Adres = item.Object.Adres,
Plaats = item.Object.Plaats
});
foreach (var item in GetItems) {
AllStudentList.Add(item);
}
}
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