我正在尝试对旧的VB Web应用程序进行一些小的更改我需要在字符串中添加引号我到目前为止没有运气.字符串是
Dim sql As String = "Select * from Usertask Where UserId = " & Session("UserId") & " and JobID=" & ddlReqTask.SelectedValue
我需要在Session("UserID")值周围添加引号.
我正在开展一个项目,允许孩子们向圣诞老人发送信息.不幸的是,如果他们在AGE字段中输入字符串而不是整数,程序崩溃并返回从字符串"[exampleString]"到"Double"类型的转换无效.有没有办法检查他们是否输入了整数？这是代码.
If childAge > 0 And childAge < 150 Then
fmSecA2 = "Wow! You are already " & childAge & " years old? You're growing to be a big " & childGender & " now! "
Else
fmSecA2 = "Erm, I couldn't really understand your age. Are you making this up? Ho ho ho!"
End If
谢谢,凯:)
我收到此错误:
超时已过期.操作完成之前经过的超时时间或服务器没有响应.
我知道已有指南帮助解决这个问题,但它们并不适合我.我错过了什么或者我应该在哪里将代码添加到我的C#程序中的这些SQL语句中:
String sql = project1.Properties.Resources.myQueryData;
SqlDataAdapter sqlClearQuestDefects = new SqlDataAdapter(sql,
"Data Source=ab;Initial Catalog=ac;User ID=ad; Password =aa");
DataSet lPlanViewData = new DataSet();
sqlClearQuestDefects.Fill(lPlanViewData, "PlanViewData");
我在这一行收到超时错误:
SqlDataAdapter sqlClearQuestDefects = new SqlDataAdapter(sql,
"Data Source=ab;Initial Catalog=ac;User ID=ad; Password =aa");
我有3个类似的功能,只根据数字类型改变:
<Extension()> _
Public Function ToNullableShort(ByVal str As String) As Short?
Dim intReturn As Short
If Short.TryParse(str, intReturn) Then
Return intReturn
Else
Return Nothing
End If
End Function
<Extension()> _
Public Function ToNullableByte(ByVal str As String) As Byte?
Dim intReturn As Byte
If Byte.TryParse(str, intReturn) Then
Return intReturn
Else
Return Nothing
End If
End Function
<Extension()> _
Public Function ToNullableLong(ByVal str As String) As Long?
Dim intReturn As Long
If Long.TryParse(str, intReturn) Then
Return intReturn
Else
Return Nothing
End If …我是VB的新手,我想继承DataGridView,我使用类似的东西
Public Class DataGridViewEx Inherits DataGridView
End Class
但是编译器在End of statement expected指向时会生成错误Inherits DataGridView.有什么不对,我应该怎么做？
我有以下(遗留的,继承自前辈)VB.Net(框架2.0)创建系统事件日志异常的类和方法:
Public Interface IMyClass
Function MyMethod(ByVal aValue As String) As Date
End Interface
Public Class MyClass
Implements IMyClass
Public Function MyMethod(ByVal aValue As String) As Date Implements IMyClass.MyMethod
Try
' Calculate return date based on aValue
Catch ex As Exception
Call MyUtilityClass.LogError("MyClass", "MyMethod", ex)
Throw
End Try
End Function
End Class
Partial Public NotInheritable Class MyUtilityClass
Public Shared Sub LogError(ByVal className As String,
ByVal methodName As String,
ByVal ex As Exception)
' Write details to Event Log
End Sub
End …如何在Bootstrap中实现以下两列布局？
例如，如果我有：
在具有800px可用宽度的分辨率中，我希望两列都为400px宽。在具有2000px的分辨率的情况下，我希望第一列为800px，第二列为400px，并且屏幕右侧将有800px的空白。
刚遇到一个奇怪的问题:
Math.Round(113.065, 2, MidpointRounding.ToEven) => 113.06
Math.Round(113.075, 2, MidpointRounding.ToEven) => 113.08
Math.Round(113.085, 2, MidpointRounding.ToEven) => 113.08
但...
Math.Round(113.095, 2, MidpointRounding.ToEven) => 113.1
为什么会这样？我希望我的结果是113.09!那可能吗？
谢谢
我有一个SortedList,其中包含键的DateTime和值的int.DateTime值将附加小时和分钟.是否有可能编写一个C#linq过程来将SortedList分组为一个Date而忽略小时并总结该值？