在VB.NET中,我可以在Windows注册表中创建一个键,如下所示:
My.Computer.Registry.CurrentUser.CreateSubKey("TestKey")
Run Code Online (Sandbox Code Playgroud)
我可以检查一个键中是否存在这样的值:
If My.Computer.Registry.GetValue("HKEY_LOCAL_MACHINE\MyKey", _
"TestValue", Nothing) Is Nothing Then
MsgBox("Value does not exist.")
Else
MsgBox("Value exist.")
End If
Run Code Online (Sandbox Code Playgroud)
但是,如何检查注册表中是否存在具有特定名称的密钥?
我有以下HTML
<style type="text/css">
<!--
.msg_ok{
font-family: "Trebuchet MS";
font-weight: bold;
font-size: 16px;
margin:0 auto;
padding:10px;
width:500px;
height:auto;
display:block;
}
.msg_ok{
background-color:#DCFFB9;
border:#003300 1px solid;
color:#003500;
}
-->
</style>
<div class="msg_ok" style="height:auto;">
<div style="display:block;float:left;width:350px; height:auto;">
<p>line 1<br>
line2<br>
line3<br>
line4<br>
line5<br>
</p>
</div>
<div style="display:block;float:left;width:100px; height:auto;">
<a href="#">Print</a>
</div>
</div>
Run Code Online (Sandbox Code Playgroud)
我得到了这个结果

但是我怎么能得到如下结果,容器div的自动高度适合其大小与内部的浮动div?

提前致谢
我不想在我的代码中使用旧的Visual Basic方法,并且我对与旧的CInt()Visual Basic方法相对应的最新VB.NET方法感到困惑.
例如,
Dim n1 as Double : n1 = CInt(2.1111111) 'Gets only 2 without rounding it
Dim n2 as Double : n2 = CInt(2.7777777) 'Get only 2 without rounding it
Run Code Online (Sandbox Code Playgroud) 我有以下代码
<tr id="myid">
<td>
<div>
...
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
...
</div>
</td>
</tr>
<tr id="anotherid">
<td>
<div>
...
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
<a href="" class="myclass"></a>
...
</div>
</td>
</tr>
Run Code Online (Sandbox Code Playgroud)
我正在尝试使用ID"myid"属性在标记TR中选择A标记但是以下代码不起作用:
$('#myid.myclass')
Run Code Online (Sandbox Code Playgroud)
如何使用TR ID选择A标签?
在MVC3中,我可以轻松地将jQuery脚本标记移动到页面底部"_Layout.vbhtml"
<script src="@Url.Content("~/Scripts/jquery-1.8.2.min.js")" type="text/javascript"></script>
Run Code Online (Sandbox Code Playgroud)
但是在ASP.NET MVC3中使用编辑器模板创建Controller时,脚手架机制会将大量文件添加到Views文件夹中,如Create.cshtml,Delete.cshtml,Details.cshtml,Edit.cshtml和Index.cshtml等......它们是强类型的.
在这些View文件中,脚本标记位于其中<body>,但如何在</body>标记之前立即将这些标记添加到页面底部?
可能重复:
如何将父元素添加到一组段落中?
我在文档中重复了以下HTML块
<!-- first block -->
<div class="first">
My first div
</div>
<div class="second">
My second div
</div>
<!-- second block -->
<div class="first">
My first div
</div>
<div class="second">
My second div
</div>
...
Run Code Online (Sandbox Code Playgroud)
如何用jQuery包装Divs以获得这样的结果HTML ...
<!-- first block -->
<div class="container">
<div class="first">
My first div
</div>
<div class="second">
My second div
</div>
</div>
<!-- second block -->
<div class="container">
<div class="first">
My first div
</div>
<div class="second">
My second div
</div>
</div>
...
Run Code Online (Sandbox Code Playgroud) 我想在DOM平方Div中绘制,单击视口中的随机点,然后用此效果移动鼠标...
http://www.vegabit.com/test/example_create_div_on_mouse_move.jpg
在jQuery中......没有任何插件......
先感谢您!
马克斯
我有一个像下面这样的功能:
Public Function testFunction(ByVal input_string As String) As String
Dim s As New StringBuilder()
Dim c As Char
For i As Integer = 0 To input_string.Length - 1
c = input_string.Chars(i)
s.Append(c)
Next
Return s.ToString
End Function
Run Code Online (Sandbox Code Playgroud)
但我想知道是否最好明确销毁任何对象,如下所示:
Public Function testFunction(ByVal input_string As String) As String
Dim s As New StringBuilder()
Dim c As Char
For i As Integer = 0 To input_string.Length - 1
c = input_string.Chars(i)
s.Append(c)
Next
Dim t As String = s.ToString
s = Nothing
Return …Run Code Online (Sandbox Code Playgroud) 我已经声明了以下WinAPI调用
<DllImport("USER32.DLL", EntryPoint:="GetActiveWindow", SetLastError:=True,
CharSet:=CharSet.Unicode, ExactSpelling:=True,
CallingConvention:=CallingConvention.StdCall)>
Public Shared Function GetActiveWindowHandle() As System.IntPtr
End Function
<DllImport("USER32.DLL", EntryPoint:="GetWindowText", SetLastError:=True,
CharSet:=CharSet.Unicode, ExactSpelling:=True,
CallingConvention:=CallingConvention.StdCall)>
Public Shared Function GetActiveWindowText(ByVal hWnd As System.IntPtr, _
ByVal lpString As System.Text.StringBuilder, _
ByVal cch As Integer) As Integer
End Function
Run Code Online (Sandbox Code Playgroud)
然后,我调用此子例程来获取活动窗口标题栏中的文本
Public Sub Test()
Dim caption As New System.Text.StringBuilder(256)
Dim hWnd As IntPtr = GetActiveWindowHandle()
GetActiveWindowText(hWnd, caption, caption.Capacity)
MsgBox(caption.ToString)
End Sub
Run Code Online (Sandbox Code Playgroud)
最后,我收到以下错误
无法在DLL"USER32.DLL"中找到名为"GetWindowText"的入口点
我该如何解决这个问题?
我有一个像这样的界面
Public Shared Function myfunction(Byval myvar as string,
Optional ByVal myarray As ArrayList = Nothing) As String
Run Code Online (Sandbox Code Playgroud)
但是我想声明一个带有默认值的可选arraylist ......怎么做?
我有一个List对象,我想删除重复的项目,但在列表中至少留下一个重复的项目;
我写了这样的东西但是我会优化这段代码以获得更好的性能,有更快的东西吗?
Const chars As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Dim rnd As New Random()
Dim mylist As List(Of String) = Enumerable.Range(1, 100).Select(Function(i) chars(rnd.Next(0, chars.Length)).ToString).ToList
For n As Integer = mylist.Count - 1 To n = 0 Step -1
'remove the item if it's duplicated
'but leave at least one of the duplicated items in the list
If mylist.IndexOf(mylist.Item(n), 0) < n Then
mylist.RemoveAt(n)
End If
Next
Run Code Online (Sandbox Code Playgroud) 我在MySql数据库中有一个表"tb_products",字段"ID"作为主键和自动递增; 在SQL中通过ID选择多个记录并使用新增加的ID将它们复制到同一个表中的最佳做法是什么?
vb.net ×6
.net ×5
html ×3
jquery ×3
dom ×2
javascript ×2
arraylist ×1
arrays ×1
css ×1
css-float ×1
dllimport ×1
double ×1
drawing ×1
field ×1
items ×1
key-value ×1
list ×1
methods ×1
mysql ×1
parent-child ×1
record ×1
registry ×1
registrykey ×1
scaffolding ×1
sql ×1
templates ×1
user32 ×1
view ×1
winapi ×1
windows ×1
winforms ×1