RectangleHotSpot.Left 属性
定义
重要
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获取或设置矩形区域左边的 x 坐标，该矩形区域由此 RectangleHotSpot 对象定义。
public:
property int Left { int get(); void set(int value); };public int Left { get; set; }member this.Left : int with get, setPublic Property Left As Integer属性值
矩形区域左边的 x 坐标，该矩形区域由此 RectangleHotSpot 对象定义。 默认值为 0。
示例
下面的代码示例演示如何以声明方式创建包含两RectangleHotSpot个 ImageMap 对象的控件。 一个 RectangleHotSpot 对象以声明方式创建，其属性（包括 属性） Left 以声明方式设置。 另一 RectangleHotSpot 个对象以编程方式创建，其属性（包括 Left 属性）以编程方式设置。 若要使此示例正常工作，必须为 属性提供自己的映像 ImageUrl ，并相应地更新映像的路径，以便应用程序能够找到它。
<%@ page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
// Programmatically create a RectangleHotSpot.
RectangleHotSpot Rectangle1 = new RectangleHotSpot();
// Set properties on Rectangle1.
Rectangle1.Top = 0;
Rectangle1.Left = 0;
Rectangle1.Bottom = 200;
Rectangle1.Right = 200;
Rectangle1.PostBackValue = "Yes";
Rectangle1.AlternateText = "Vote yes";
// Add the RectangleHotSpot object to the
// Vote ImageMap control's HotSpotCollection.
Vote.HotSpots.Add(Rectangle1);
}
void VoteMap_Clicked(object sender, ImageMapEventArgs e)
{
// When a user clicks the "Yes" hot spot,
// display the hot spot's value.
if (e.PostBackValue == "Yes")
Message1.Text = "You selected " + e.PostBackValue + ".";
else if (e.PostBackValue == "No")
// When a user clicks the "No" hot spot,
// display the hot spot's value.
Message1.Text = "You selected " + e.PostBackValue + ".";
else
Message1.Text = "You did not click a valid hot spot region.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>RectangleHotSpot Properties Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>RectangleHotSpot Properties Example</h3>
<!-- Change or remove the width and height attributes as
appropriate for your image. -->
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
alternatetext="Voting choices"
hotspotmode="PostBack"
width="400"
height="200"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
<%@ page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Programmatically create a RectangleHotSpot.
Dim Rectangle1 As New RectangleHotSpot
' Set properties on Rectangle1.
Rectangle1.Top = 0
Rectangle1.Left = 0
Rectangle1.Bottom = 200
Rectangle1.Right = 200
Rectangle1.PostBackValue = "Yes"
Rectangle1.AlternateText = "Vote yes"
' Add the RectangleHotSpot object to the
' Vote ImageMap control's HotSpotCollection.
Vote.HotSpots.Add(Rectangle1)
End Sub
Sub VoteMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
' When a user clicks the "Yes" hot spot,
' display the hot spot's value.
If (e.PostBackValue = "Yes") Then
Message1.Text = "You selected " & e.PostBackValue & "."
' When a user clicks the "No" hot spot,
' display the hot spot's value.
ElseIf (e.PostBackValue = "No") Then
Message1.Text = "You selected " & e.PostBackValue & "."
Else
Message1.Text = "You did not click a valid hot spot region."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>RectangleHotSpot Properties Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>RectangleHotSpot Properties Example</h3>
<!-- Change or remove the width and height attributes as
appropriate for your image. -->
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
alternatetext="Voting choices"
hotspotmode="PostBack"
width="400"
height="200"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
注解
属性 Left 允许您获取或设置一个值，该值表示此 RectangleHotSpot 对象定义的矩形区域左侧的 x 坐标。 若要完全定义 RectangleHotSpot 对象，必须为此属性和 Top、 Right和 Bottom 属性指定值。
