将数组值分配给某个变量 [英] Assign array value to some variable

问题描述

数组USStates填充了显示的值，但如果我想要

来访问数组中的这个值，它是如何构成的。

通过USStates（1） ）剂量工作。

 USStates.Add（新USState（Alabama，AL））; 
 
 
< pre lang =cs> //使用数组作为DataSource填充列表框。 
< b> ArrayList USStates = new ArrayList（）;< / b> 
< b> USStates.Add（new USState（& quot; Alabama& quot;，& quot; AL& quot;））< / b> ;; 
 USStates.Add（new USState（& quot; Washington& quot;，& quot; WA& quot;））; 
 USStates.Add（new USState（& quot; West Virginia& quot;，& quot; WV& quot;））; 
 USStates.Add（new USState（& quot; Wisconsin& quot;，& quot; WI& quot;））; 
 USStates.Add（new USState（& quot; Wyoming& quot;，& quot; WY& quot;））; 
 ListBox1.DataSource = USStates; 
 
 //将长名称设置为要显示的属性，将短
 //名称设置为选择行时要返回的值。这里
 //这些是属性;如果我们绑定到数据库表或
 //查询，这些可能是列名。 
 ListBox1.DisplayMember =& quot; LongName& quot ;; 
 ListBox1.ValueMember =& quot; ShortName& quot ;; 
 
 public class USState 
 {
 private string myShortName; 
 private string myLongName; 
 
 public USState（string strLongName，string strShortName）
 {
 
 this.myShortName = strShortName; 
 this.myLongName = strLongName; 
} 
 
 public string ShortName 
 {
 get 
 {
 return myShortName; 
} 
} 
 
公共字符串LongName 
 {
 
 get 
 {
 return myLongName; 
} 
} 
 
} 
}< / pre> 

解决方案

请检索您的数据，如下所示。您必须将特定索引值强制转换为UsState类。

 ArrayList arrayList =  new  ArrayList（）; 
  var  usStateItem =  new  UsState（ 我们，  Usa）; 
 arrayList.Add（usStateItem）; 
 UsState usState =（UsState）arrayList [ 0 ]; 

希望这有帮助

您可以使用 [] 运算符来访问 ArrayList 项目，例如

 ArrayList al =  new  ArrayList（）; 
 al.Add（  foo）; 
 al.Add（  boo）; 
 al.Add（  goo）; 
 Console.WriteLine（ 项目1为{0}，al [ 1 ]）; 
 al [ 1 ] =   hoo ; 
 Console.WriteLine（ 现在项目1为{0}，al [ 1 ]）; 
 

请考虑使用 List< string>< / string> 而不是 ArrayList 。

USState obj =（USState）USStates [0];

string longname = obj.LongName;

string shortname = obj.ShortName;



//如果你创建列表而不是ArrayList

列表< USState> USStates =  new  List< USState>（）; 
  string  longname = USStates [ 0 ]。LongName; 
  string  shortname = USStates [ 0 ]。ShortName; 

Array USStates is populated with the values as shown but if i want
to access this values within the array, how is it posssible.
Refrencing through USStates(1) dosent work.

USStates.Add(new USState("Alabama", "AL"));


<pre lang="cs">// Populate the list box using an array as DataSource.
           <b> ArrayList USStates = new ArrayList();</b>
           <b> USStates.Add(new USState(&quot;Alabama&quot;, &quot;AL&quot;))</b>;
            USStates.Add(new USState(&quot;Washington&quot;, &quot;WA&quot;));
            USStates.Add(new USState(&quot;West Virginia&quot;, &quot;WV&quot;));
            USStates.Add(new USState(&quot;Wisconsin&quot;, &quot;WI&quot;));
            USStates.Add(new USState(&quot;Wyoming&quot;, &quot;WY&quot;));
            ListBox1.DataSource = USStates;

            // Set the long name as the property to be displayed and the short
            // name as the value to be returned when a row is selected.  Here
            // these are properties; if we were binding to a database table or
            // query these could be column names.
            ListBox1.DisplayMember = &quot;LongName&quot;;
            ListBox1.ValueMember = &quot;ShortName&quot;;

public class USState
    {
        private string myShortName;
        private string myLongName;

        public USState(string strLongName, string strShortName)
        {

            this.myShortName = strShortName;
            this.myLongName = strLongName;
        }

        public string ShortName
        {
            get
            {
                return myShortName;
            }
        }

        public string LongName
        {

            get
            {
                return myLongName;
            }
        }

    }
}</pre>

解决方案

Please retrieve your data like below.You must cast the particular index value to UsState class.

ArrayList arrayList=new ArrayList();
            var usStateItem=new UsState("Us","Usa");
            arrayList.Add(usStateItem);
            UsState usState = (UsState)arrayList[0];

Hope this helps

You may use the [] operator to access ArrayList items, e.g.

ArrayList al=new ArrayList();
al.Add("foo");
al.Add("boo");
al.Add("goo");
Console.WriteLine("Item 1 is {0}", al[1]);
al[1] = "hoo";
Console.WriteLine("Now item 1 is {0}", al[1]);

Please consider using List<string></string> instead of the ArrayList.

USState obj = (USState)USStates[0];
string longname= obj.LongName;
string shortname= obj.ShortName;

//if u create List instead of ArrayList

List<USState> USStates=new List<USState>();
string longname=USStates[0].LongName;
string shortname=USStates[0].ShortName;

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