我从列表中以编程方式创建了一个网格。但是,我也在使用freshmvvm
,这给我带来了推新页面的麻烦。我注意到CoreMethods
为空。这是我的班级。
using System;
using CashRegisterApp.ViewModels;
using Xamarin.Forms;
namespace CashRegisterApp.Pages
{
//[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class InventoryPage : ContentPage
{
public InventoryPage()
{
InitializeComponent();
BindingContext = new InventoryViewModel();
CreateGrid();
}
/// <summary>
/// Creates a grid specifically with the needed columns and rows for the list in the viewmodel
/// </summary>
private void CreateGrid()
{
//var grdInventory = new Grid();
if (BindingContext is InventoryViewModel vm)
{
var buttonList = vm.Buttons;
//determine the amount of rows needed to create the full grid of buttons
var x = 5;
decimal rowCount = buttonList.Count / x;
var y = Math.Round(rowCount, MidpointRounding.AwayFromZero);
if (y == 0)
{
y = 1;
}
//declare the rows and the columns
for (int i = 0; i != x; i++)
{
grdInventory.ColumnDefinitions.Add(new ColumnDefinition{ Width = new GridLength(1, GridUnitType.Star)});
}
for (int i = 0; i != y; i++)
{
grdInventory.RowDefinitions.Add(new RowDefinition{ Height = new GridLength(220)});
}
//fill in the grid using for loops atm cus it is the solution i know
var count = 0;
for (int i = 0; i != y && count != buttonList.Count; i++)
{
for (int j = 0; j != x && count != buttonList.Count; j++)
{
grdInventory.Children.Add(buttonList[count], j, i);
count++;
}
}
}
}
}
}
互联网并没有真正有用。然而,因为设置bindingcontext
而在某人周围阅读时说。但如果我不这样做,我就无法使用viewmodel
中的列表。我该如何解决这个问题?
答案 0 :(得分:0)
根据FreshMvvm的约定配置机制,您需要从FreshBaseContentPage而不是ContentPage继承InventoryPage。
注意:您需要遵守该机制,即我们的页面名称(AKA视图)必须以&#34; Page&#34;并且我们的pageModels(AKA viewModel)的名称必须以&#34; PageModel&#34;结尾,例如: 页面-------&gt;我的页面 PageModel - &gt; MyPageModel
遵循该规则,您的BindingContext将自动正确设置。