在Xamarin Forms中使用Children.Add时出错

Question

我在Stack Layout的Children.Add（）函数中遇到了一些问题。下面的代码中有一个错误，上面写着“没有与'SettersExtentions.Add（IList，Bindable Property，object）'”所需的形式参数'value'相对应的参数。所有.Add单词下的错误都是红色下划线。

public class LoginPage : ContentPage
{
    public string email { get; set; }
    public string password { get; set; }
    Entry emailBox = new Entry();
    Entry passwordBox = new Entry();
    Button createAccount = new Button();
    Button forgotPassword = new Button();
    Layout layout = new StackLayout();


    public LoginPage()
    {
        Title = "Login";
        emailBox.Placeholder = "email";
        passwordBox.Placeholder = "password";
        passwordBox.IsPassword = true;

        createAccount.Text = "Create Account";
        createAccount.Font = Font.SystemFontOfSize(NamedSize.Large);
        createAccount.BorderWidth = 1;
        createAccount.HorizontalOptions = LayoutOptions.Center;
        createAccount.VerticalOptions = LayoutOptions.CenterAndExpand;

        forgotPassword.Text = "Forgot Password";
        forgotPassword.Font = Font.SystemFontOfSize(NamedSize.Large);
        forgotPassword.BorderWidth = 1;
        forgotPassword.HorizontalOptions = LayoutOptions.Center;
        forgotPassword.VerticalOptions = LayoutOptions.CenterAndExpand;

        layout.VerticalOptions = LayoutOptions.CenterAndExpand;

        layout.Children.Add(emailBox);
        layout.Children.Add(passwordBox);
        layout.Children.Add(createAccount);
        layout.Children.Add(forgotPassword);

        Content = layout;

    }

    public void Check(string email, string password, string cpassword)
    {

    }
}

Answer 1

qazxsw poi是一个只读qazxsw poi所以你将无法添加它。

然而Layout.Children是IReadOnlyList<Element>，它允许你添加孩子

更改

StackLayout.Children

至

IList<T>

这将允许您能够将子元素添加到布局中。