Question

我在asp.net/C#/VS2008的web应用程序项目中有一个arraylist，我正在使用.net 3.5

我正在使用一个定义如下的类向arraylist添加内容：

using System.Web;

class ShoppingCartDataStore
{
    private string componentName;
    private string componentPrice;
    private string componentFileSize;
    private string componentDescription;

    public ShoppingCartDataStore(string componentName, string componentPrice, string componentFileSize, string componentDescription){
        this.componentName = componentName;
        this.componentPrice = componentPrice;
        this.componentFileSize = componentFileSize;
        this.componentDescription = componentDescription;
    }

    public string ComponentName
    {
        get
        {
            return this.componentName;
        }
    }

    public string ComponentPrice
    {
        get
        {
            return this.componentPrice;
        }
    }

    public string ComponentFileSize
    {
        get
        {
            return this.componentFileSize;
        }
    }

    public string ComponentDescription
    {
        get
        {
            return this.componentDescription;
        }
    }
}

我正在通过以下代码向arraylist添加内容：

ArrayList selectedRowItems = new ArrayList();
selectedRowItems.Add(new ShoppingCartDataStore(componentName, componentPrice, fileSize, componentDescription));

假设我想以这种方式添加几个值并以componentName作为键来搜索这个arraylist。我尝试了以下代码，但我无法找到一种方法：

ArrayList temporarySelectedItemsList = new ArrayList();
ArrayList presentValue = new ArrayList();
string key = componentName; //some specific component name
temporarySelectedItemsList = selectedRowItems;
for (int i = 0; i < temporarySelectedItemsList.Count; i++)
{
    presentValue = (ArrayList)temporarySelectedItemsList[i];
}

Answer 1

var results = selectedRowItems.OfType<ShoppingCartDataStore>().Where(x=>x.ComponentName == "foo")

当然，如果你使用的是通用列表而不是arraylist，你可以摆脱OfType

编辑：所以，我不知道你为什么不使用LINQ或泛型，如果你在3.5。但如果你必须：

ArrayList results = new ArrayList();


foreach (ShoppingCartDataStore store in selectedRowItems)
{
    if(store.ComponentName == "foo"){
        results.Add(store);
    }
}

Answer 2

我生病了，这是未经测试的，但我认为它会起作用。：）

List<ShoppingCartDataStore> aList = new List<ShoppingCartDataStore>();
// add your data here

string key = componentName; //some specific component name
// Now search
foreach (ShoppingCartDataStore i in aList)
{
    if (i.ComponentName == key)
    {
        // Found, do something
    }
}

搜索一个arraylist

2 个答案: