Question

我在这里有一些代码，简短的灰色解释（编码注释）：

namespace FridgeApp
{
    [Activity( MainLauncher = true, Icon = "@drawable/icon")]
    public class MenuActivity : Activity
    {
        public string content;
        ListView productsListView;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

           SetContentView(Resource.Layout.Menu);

            //GETTING ACCES TO XML FILES
            AssetManager assets = this.Assets;

            //PLACING CONTENT OF XML FILE "products.xml" TO 'content' VARIABLE
            using (StreamReader sr = new StreamReader(Assets.Open("products.xml")))
            {
                content = sr.ReadToEnd();
            }

            List<Product> _productsList = ProductsFromXml();

            //CONVERTING FROM LIST TO AN ARRAY
            Array prdcts = _productsList.ToArray();

            Button button = FindViewById<Button>(Resource.Id.button1);

            //BY CLICKING A BUTTON APP SETS ANOTHER LAYOUT AND DISPLAYS A LIST OF PRODUCTS
            button.Click += delegate
            {
                SetContentView(Resource.Layout.ProductsList);
                productsListView = FindViewById<ListView>(Resource.Id.listView1);
                productsListView.Adapter = new ArrayAdapter (this, Android.Resource.Layout.SimpleListItemMultipleChoice, prdcts );
                productsListView.ChoiceMode = ChoiceMode.Multiple;
            };                          
        }

        //THIS MEHOD READS ACTUAL DATA FROM XML FILE "products.xml" AND PLACES IT IN  LIST 'productsList' 
        public List<Product> ProductsFromXml()
        {
            List<Product> productsList = new List<Product>();

            XmlDocument productsXml = new XmlDocument();
            productsXml.LoadXml(content);

            XmlNode root = productsXml.SelectSingleNode("CurrentProducts");
            XmlNodeList nodeList = root.SelectNodes("Product");
            foreach (XmlNode n in nodeList)
            {
                Product p = new Product();
                p.Name = n.SelectSingleNode("Name").InnerText;
                p.Quantity = n.SelectSingleNode("Quantity").InnerText;
                productsList.Add(p);
            }
            return productsList;
        }
    }
}

对于每个产品＆＃39;名称＆＃39;和＆＃39;数量＆＃39;有一个类，这些参数创建名为＆＃39;产品＆＃39;。有一个XML文件：

<CurrentProducts>
<Product>
    <Name>Apple</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Banana</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Bread</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Butter</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Cucumber</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Milk</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Cheese</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Smoked Sausage</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Tomato</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Egg</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Chicken</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Chocolate</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Potato</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Onion</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Lettuce</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Sour Cream</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Tomato Sauce</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Carrot</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Orange Juice</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Salmon</Name>
    <Quantity>1</Quantity>
</Product>
<Product>
    <Name>Flavour</Name>
    <Quantity>1 kg</Quantity>
</Product>
<Product>
    <Name>Salt</Name>
    <Quantity>1 kg</Quantity>
</Product>
<Product>
    <Name>Sugar</Name>
    <Quantity>1 kg</Quantity>
</Product>

以下是点击按钮并显示数组内容时仿真器屏幕的照片：

问题是，为什么它显示Products.Product而不是products.xml中写的实际产品？

以下是该类的代码：

  public class Product
  { 

    public string Name;
    public string Quantity;
    public MeasurementType UnitMeasure;

    public Product()
    {
    }

    public Product(string _name)
    {
        this.Name = _name;
    }

Answer 1

您应该共享Product类的代码;我相信ListView正在对产品对象调用ToString()，他们只是返回类型名称，因为类型不知道更好。

尝试添加：

class Product
{
    public override string ToString()
    {
        // Format your product name here as you want it to be displayed.
        return $"{Name} - {Quantity}";
    }
}

为什么ListView显示Object.object而不是数据？

1 个答案: