ASP.Net/Collections/Array

Материал из .Net Framework эксперт
Версия от 14:51, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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Array.IndexOf and Array.LastIndexOf (VB.net)

   <source lang="csharp">

<%@Page language="vb" %> <script runat="server" language="vb"> 

 Sub Page_Load()
   Dim intCounter As Integer = -1
   Dim AnimalArray(4) As string
   AnimalArray(0) = "Dog"
   AnimalArray(1) = "Cat"
   AnimalArray(2) = "Elephant"
   AnimalArray(3) = "Lion"
   AnimalArray(4) = "Cat"
   Do
     intCounter = Array.IndexOf(AnimalArray, "Cat", intCounter+1)
     MyText.InnerHtml += "AnimalArray(" & intCounter & ")
"
   Loop Until intCounter = Array.LastIndexOf(AnimalArray, "Cat")
 End Sub

</script> <html> 

 The string "Cat" occurs in the following elements:
 

 <div id="MyText" runat="server" />

</html> 

      </source>


Array.IndexOf(), Array.LastIndexOf() (C#)

   <source lang="csharp">

<%@Page Language="c#" %> <script runat="server" Language="c#"> 

 void Page_Load() 
 {
   int intCounter = -1;
   string[] AnimalArray = new string[5]
               {  "Dog", "Cat", "Elephant", "Lion", "Cat"};
   do
   {
     intCounter = Array.IndexOf(AnimalArray, "Cat", intCounter+1);
     MyText.InnerHtml += "AnimalArray[" + intCounter + "]
";
   } while (intCounter != Array.LastIndexOf(AnimalArray, "Cat")); 
 }

</script> <html> 

 The string "Cat" occurs in the following elements:
 

 <div id="MyText" runat="server" />

</html> 

      </source>


Array Reverse Demo (VB.net)

   <source lang="csharp">

<%@Page language="vb" %> <script runat="server" language="vb"> 

 Sub Page_Load()
   Dim AnimalArray(4) As String
   Dim strAnimal As String
   AnimalArray(0) = "Dog"
   AnimalArray(1) = "Cat"
   AnimalArray(2) = "Elephant"
   AnimalArray(3) = "Lion"
   AnimalArray(4) = "Cat"
   Array.Reverse(AnimalArray)
   For Each strAnimal In AnimalArray
     MyDropDownList.Items.Add(strAnimal)
   Next
 End Sub

</script> <html> <form id="Form1" method="post" runat="server"> <asp:dropdownlist id="MyDropDownList" runat="server" /> </form> </html> 


      </source>


Change array length (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <script runat="server"> 

   Dim ColorList(6) as String
   Sub Page_Load
     ColorList(0) = "Red"
     ColorList(1) = "Orange"
     ColorList(2) = "Yellow"
     ColorList(3) = "Green"
     ColorList(4) = "Blue"
     ColorList(5) = "Indigo"
     ColorList(6) = "Violet"
     ReDim Preserve ColorList(7)
     ColorList(7) = "Magenta"
   
     If Not Page.IsPostback
       Dim ColorName as String
   
       For Each ColorName in ColorList
         ddlColorList.Items.Add(ColorName)
       Next
     End If
   End Sub
   
   Sub btnSelectColor_Click(sender As Object, e As EventArgs)
     lblOutputMessage.Text = "You selected " & ddlColorList.SelectedItem.Value
     lblOutputMessage.ForeColor = _
       System.Drawing.Color.FromName(ddlColorList.SelectedItem.Text)
   End Sub

</script> <html> <head> </head> <body> 

   <form runat="server">

Select a color from the list:<asp:DropDownList id="ddlColorList" runat="server"></asp:DropDownList> <asp:Button id="btnSelectColor" onclick="btnSelectColor_Click" runat="server" Text="Click here!"></asp:Button>

<asp:Label id="lblOutputMessage" runat="server"></asp:Label> 

   </form>

</body> </html> 

      </source>


Define and use array (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <script runat="server"> 

   Dim ColorList(6) as String
   
   Sub Page_Load
     ColorList(0) = "Red"
     ColorList(1) = "Orange"
     ColorList(2) = "Yellow"
     ColorList(3) = "Green"
     ColorList(4) = "Blue"
     ColorList(5) = "Indigo"
     ColorList(6) = "Violet"
           
     If Not Page.IsPostback
       Dim ColorName as String
   
       For Each ColorName in ColorList
         ddlColorList.Items.Add(ColorName)
       Next
     End If
   End Sub
   
   Sub btnSelectColor_Click(sender As Object, e As EventArgs)
     lblOutputMessage.Text = "You selected " & ddlColorList.SelectedItem.Value
     lblOutputMessage.ForeColor = _
       System.Drawing.Color.FromName(ddlColorList.SelectedItem.Text)
   End Sub

</script> <html> <head> </head> <body> 

   <form runat="server">

Select a color from the list:<asp:DropDownList id="ddlColorList" runat="server"></asp:DropDownList> <asp:Button id="btnSelectColor" onclick="btnSelectColor_Click" runat="server" Text="Click here!"></asp:Button>

<asp:Label id="lblOutputMessage" runat="server"></asp:Label> 

   </form>

</body> </html> 

      </source>


For each loop: array (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <script runat="server"> 

   Dim ColorList(6) as String
   
   Sub Page_Load
     ColorList(0) = "Red"
     ColorList(1) = "Orange"
     ColorList(2) = "Yellow"
     ColorList(3) = "Green"
     ColorList(4) = "Blue"
     ColorList(5) = "Indigo"
     ColorList(6) = "Violet"
     Array.Sort(ColorList)
     
     If Not Page.IsPostback
       Dim ColorName as String
   
       For Each ColorName in ColorList
         ddlColorList.Items.Add(ColorName)
       Next
     End If
   End Sub
   
   Sub btnSelectColor_Click(sender As Object, e As EventArgs)
     lblOutputMessage.Text = "You selected " & ddlColorList.SelectedItem.Value
     lblOutputMessage.ForeColor = _
       System.Drawing.Color.FromName(ddlColorList.SelectedItem.Text)
   End Sub

</script> <html> <head> </head> <body> 

   <form runat="server">

Select a color from the list:<asp:DropDownList id="ddlColorList" runat="server"></asp:DropDownList> <asp:Button id="btnSelectColor" onclick="btnSelectColor_Click" runat="server" Text="Click here!"></asp:Button>

<asp:Label id="lblOutputMessage" runat="server"></asp:Label> 

   </form>

</body> </html> 

      </source>


For Each loop through an Array (VB.net)

   <source lang="csharp">

<%@Page language="vb" %> <script runat="server" language="vb"> 

 Sub Page_Load()
   Dim AnimalArray(4) As String
   Dim strAnimal As String
   AnimalArray(0) = "Dog"
   AnimalArray(1) = "Cat"
   AnimalArray(2) = "Elephant"
   AnimalArray(3) = "Lion"
   AnimalArray(4) = "Cat"
   For Each strAnimal In AnimalArray
     MyDropDownList.Items.Add(strAnimal)
   Next
 End Sub

</script> <html> <form id="Form1" method="post" runat="server"> <asp:dropdownlist id="MyDropDownList" runat="server" /> </form> </html> 

      </source>


Get array by index (VB.net)

   <source lang="csharp">

<%@Page language="vb" %> <script runat="server" language="vb"> 

 Sub Page_Load(Source As Object, E as EventArgs)
   Dim AnimalArray(4) as string
   AnimalArray(0) = "Dog"
   AnimalArray(1) = "Cat"
   AnimalArray(2) = "Elephant"
   AnimalArray(3) = "Lion"
   AnimalArray(4) = "Cat"
   MyLabel.Text = AnimalArray.GetValue(2)
 End Sub

</script> <html> <form id="Form1" method="post" runat="server"> <asp:label id="MyLabel" runat="server" /> </form> </html> 

      </source>


Get array element by index (C#)

   <source lang="csharp">

<%@Page Language="c#" %> <script runat="server" Language="c#"> 

 void Page_Load() 
 {
   string[] AnimalArray = new string[5]{  "Dog", "Cat", "Elephant", "Lion", "Cat"};
   MyLabel.Text = AnimalArray.GetValue(2).ToString();
 }

</script> <html> 

 <asp:label id="MyLabel" runat="server" />

</html> 

      </source>


Sort an Array (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <script runat="server"> 

   Dim ColorList(6) as String
   
   Sub Page_Load
     ColorList(0) = "Red"
     ColorList(1) = "Orange"
     ColorList(2) = "Yellow"
     ColorList(3) = "Green"
     ColorList(4) = "Blue"
     ColorList(5) = "Indigo"
     ColorList(6) = "Violet"
     Array.Sort(ColorList)
     
     If Not Page.IsPostback
       Dim ColorName as String
   
       For Each ColorName in ColorList
         ddlColorList.Items.Add(ColorName)
       Next
     End If
   End Sub
   
   Sub btnSelectColor_Click(sender As Object, e As EventArgs)
     lblOutputMessage.Text = "You selected " & ddlColorList.SelectedItem.Value
     lblOutputMessage.ForeColor = _
       System.Drawing.Color.FromName(ddlColorList.SelectedItem.Text)
   End Sub

</script> <html> <head> </head> <body> 

   <form runat="server">

Select a color from the list:<asp:DropDownList id="ddlColorList" runat="server"></asp:DropDownList> <asp:Button id="btnSelectColor" onclick="btnSelectColor_Click" runat="server" Text="Click here!"></asp:Button>

<asp:Label id="lblOutputMessage" runat="server"></asp:Label> 

    </form>

</body> </html> 

      </source>


Sort array reversely (C#)

   <source lang="csharp">

<%@Page Language="c#" %> <script runat="server" Language="c#"> 

 void Page_Load()
 {
   string[] AnimalArray = new string[5]
                { "Dog", "Cat", "Elephant", "Lion", "Cat" };
   Array.Reverse(AnimalArray);
   foreach (string strAnimal in AnimalArray)
   {
     MyDropDownList.Items.Add(strAnimal);
   }
 }

</script> <html> <form id="Form1" method="post" runat="server"> <asp:dropdownlist id="MyDropDownList" runat="server" /> </form> </html> 

      </source>


Use array: find item index (C#)

   <source lang="csharp">

<%@ Page Language="C#" Debug="true" %> <script runat="server"> void Page_Load(){ 

  if (Page.IsPostBack){
      string[] choice = new string[3];
      choice[0] = "1";
      choice[1] = "2";
      choice[2] = "3";
      lblShipper.Text = "Shipper ID for " + txtShipNum.Text + " is " + Array.IndexOf(choice, txtShipNum.Text);
      lblShipper.Visible = true;
  }

} </script> <html> <head> 

   <title>Array Example</title>

</head> <body> 

   <form runat="server">
       Please enter your shipper name. 
       (should be "1"  or  "2"  or  "3") 
       
<asp:TextBox id="txtShipNum" runat="server" width="300px"></asp:TextBox>
       

       Press button to find the Shipper ID number
       <asp:Button id="Button1" runat="server" Text="Submit"></asp:Button>
       

       <asp:Label id="lblShipper" runat="server"></asp:Label>
   </form>

</body> </html> 

      </source>


Use String Array to store Asp Label Text (C#)

   <source lang="csharp">

<%@ Page Language="C#" Debug="true" %> <script runat="server"> 

   void Page_Load()
   {
   string [] strMarx = new string[6];
   strMarx[0] = "A";
   strMarx[1] = "B";
   strMarx[2] = "C";
   strMarx[3] = "D";
   strMarx[4] = "E";
   strMarx[5] = "F";
   
   lblMarx.Text = strMarx[3];
   string [] strFriends = new string[5];
   strFriends[1] = "Mr. J";
   strFriends[4] = "Mr. G";
   strFriends[3] = "Mrs. S";
   lblFriend.Text = strFriends[4];
   }

</script> <html> <head> 

   <title>Array Example</title>

</head> <body> 

   <form runat="server">
       A Marx Brother: 
       <asp:Label id="lblMarx" runat="server"></asp:Label>

       A friend: 
       <asp:Label id="lblFriend" runat="server"></asp:Label>

   </form>

</body> </html> 

      </source>


Use Two dimensional array (C#)

   <source lang="csharp">

<%@ Page Language="C#" Debug="true" %> <script runat="server"> 

   void Page_Load()
   {
       if(Page.IsPostBack)
       {
           string [,] strClient = new string[4,3]; // 4 people, 3 attributes each
       
           strClient[0,0] = "First Name 1";
           strClient[0,1] = "Last Name 1";
           strClient[0,2] = "111-111-1111";
           strClient[1,0] = "First Name 2";
           strClient[1,1] = "Last Name 2";
           strClient[1,2] = "222-222-2222";
           strClient[2,0] = "First Name 3";
           strClient[2,1] = "Last Name 3";
           strClient[2,2] = "333-333-3333";
           strClient[3,0] = "First Name 4";
           strClient[3,1] = "Last Name 4";
           strClient[3,2] = "444-444-4444";
       
           int intIDnumber = Convert.ToInt32(txtID.Text);
       
           lblNameFirst.Text = strClient[intIDnumber,0];
           lblNameLast.Text = strClient[intIDnumber,1];
           lblTel.Text = strClient[intIDnumber,2];
       
       }
   
   }

</script> <html> <head> 

   <title>Array Multidimensional Example</title>

</head> <body> 

   <form runat="server">
       Enter a client number (from 0 to 3) 
       <asp:TextBox runat="server" ID="txtID"></asp:TextBox>

       
       <asp:Label id="lblNameFirst" runat="server"></asp:Label>

       <asp:Label id="lblNameLast" runat="server"></asp:Label>

       <asp:Label id="lblTel" runat="server"></asp:Label>

       
       <asp:Button runat="server" Text="Button"></asp:Button>
   </form>

</body> </html> 

      </source>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Collections/Array&oldid=1759»