I want make this in linq to sql select isnull(x.COD, '1') as 'NCOD' from table x I have tried this. From x In table select NCOD = x.COD ?? '1'; I'm using LINQPad 4 and VB Expression. but LINQPAd says that I can't use ? expression (No se puede usar aquí el carácter '?' in Spanish) Any idea? PD: sorry for my English. If your value type is string, you can use following ex
我想要在LINQ到SQL select isnull(x.COD, '1') as 'NCOD' from table x 我试过这个。 From x In table select NCOD = x.COD ?? '1'; 我正在使用LINQPad 4和VB Expression。 但LINQPAd说我不能使用？ 表达方式（西班牙语中没有使用西班牙语） 任何想法？ PD：对不起我的英文。 如果你的值类型是字符串，你可以使用下面的表达式： result = from x in values select IF(String.IsNullOrEmpty(x),"No value",x); 如果
I'm running through a loop adding parameters, when I get to a NULL, the program punts. My statement looks like this: mysql = "Insert into TABLE (field1) VALUES (:Col1)" mycomm = New NpgsqlCommand (mySQL, conn) myComm.Parameters.Add("Col" & cCnt, NpgsqlTypes.NpgsqlDbType.Double).Value = Obj.value myComm.ExecuteNonQuery() This works fine if Obj.value is not empty, but if Obj.value is
我正在运行一个循环添加参数，当我到达一个NULL时，程序会出现。 我的发言如下所示： mysql = "Insert into TABLE (field1) VALUES (:Col1)" mycomm = New NpgsqlCommand (mySQL, conn) myComm.Parameters.Add("Col" & cCnt, NpgsqlTypes.NpgsqlDbType.Double).Value = Obj.value myComm.ExecuteNonQuery() 这工作正常，如果Obj.value不是空的，但如果Obj.value是什么都没有，我的执行语句失败。 我想只在数据库中插
I'm using an SQLDataReader to retrieve values from a database which may be null. I've worked out how to handle Null string values but can't get the same trick to work with integers or booleans: Using cmd As DbCommand = store.GetStoredProcCommand("RetrievePOCO") store.AddInParameter(cmd, "ID", DbType.Int32, ID) Using reader As IDataReader = store.ExecuteReader(cmd) If
我正在使用SQLDataReader从数据库中检索可能为空的值。 我已经制定了如何处理空字符串值，但无法获得与整数或布尔值一起使用的相同技巧： Using cmd As DbCommand = store.GetStoredProcCommand("RetrievePOCO") store.AddInParameter(cmd, "ID", DbType.Int32, ID) Using reader As IDataReader = store.ExecuteReader(cmd) If reader.Read() = True Then Dim newPOCO As New POCO()
I'm having problems with a Nullable DateTime in VB.NET (VS 2010). Method 1 If String.IsNullOrEmpty(LastCalibrationDateTextBox.Text) Then gauge.LastCalibrationDate = Nothing Else gauge.LastCalibrationDate = DateTime.Parse(LastCalibrationDateTextBox.Text) End If Method 2 gauge.LastCalibrationDate = If(String.IsNullOrEmpty(LastCalibrationDateTextBox.Text), Nothing, DateTime.Parse(La
我在VB.NET中遇到Nullable DateTime问题（VS 2010）。 方法1 If String.IsNullOrEmpty(LastCalibrationDateTextBox.Text) Then gauge.LastCalibrationDate = Nothing Else gauge.LastCalibrationDate = DateTime.Parse(LastCalibrationDateTextBox.Text) End If 方法2 gauge.LastCalibrationDate = If(String.IsNullOrEmpty(LastCalibrationDateTextBox.Text), Nothing, DateTime.Parse(LastCalibrationDateTextBox.
I have an update function that updates an sql server db table through a dataset. One of the fields in the table is an integer and accepts null values. So when I am populating the update function I need a way to enter a null in when the function wants an integer. I tried to do it this way but _intDLocation = "" throws an exception Dim _dLocation As String = udDefaultLocationTextEdit
我有一个更新函数，通过数据集更新一个sql server数据库表。 表中的一个字段是一个整数并接受空值。 所以当我填充更新函数时，我需要一种在函数需要一个整数时输入null的方法。 我试图这样做，但_intDLocation = ""引发异常 Dim _dLocation As String = udDefaultLocationTextEdit.Text Dim _intDLocation As Integer If _dLocation <> "" Then _intDLocation = Integer.Parse(udDefaultLoc
Is it possible to do one line if statement in VB .NET? If so, how? Use IF(). It is a short-circuiting ternary operator. Dim Result = IF(expression,<true return>,<false return>) SEE ALSO: IIF becomes If, and a true ternary operator Is there a conditional ternary operator in VB.NET? Orcas introduces the IF operator - a new and improved IIF The Ternary Operator in VB.NET
是否有可能在VB .NET中执行一行语句？ 如果是这样，怎么样？ 使用IF（）。 这是一个短路的三元操作符。 Dim Result = IF(expression,<true return>,<false return>) 也可以看看： IIF成为If和一个真正的三元运算符 VB.NET中是否有条件的三元运算符？ 奥卡斯介绍了IF运营商 - 一种新的改进的IIF VB.NET中的三元运算符 这其实很简单.. If CONDITION Then ..INSERT CODE HERE.. 在由purest和c＃程序员
This question already has an answer here: Is there a conditional ternary operator in VB.NET? 8 answers outcome = If(success,"succeeded","failed")
这个问题在这里已经有了答案： VB.NET中是否有条件的三元运算符？ 8个答案 outcome = If(success,"succeeded","failed")
Possible Duplicate: Is there a conditional ternary operator in VB.NET? Hi guys, Can we use Coalesce operator(??) and conditional ternary operator(:) in VB.NET as in C#? 我想你可以使用内联if语句来关闭它： //C# int x = a ? b : c; 'VB.Net Dim x as Integer = If(a, b, c) Sub Main() Dim x, z As Object Dim y As Nullable(Of Integer) z = "1243" Dim c As Object = Coalesce(x, y, z) En
可能重复： VB.NET中是否有条件的三元运算符？ 嗨，大家好，我们可以在C＃中使用VB.NET中的Coalesce运算符（??）和条件三元运算符（:)吗？ 我想你可以使用内联if语句来关闭它： //C# int x = a ? b : c; 'VB.Net Dim x as Integer = If(a, b, c) Sub Main() Dim x, z As Object Dim y As Nullable(Of Integer) z = "1243" Dim c As Object = Coalesce(x, y, z) End Sub Private Function Coalesce(ByVal
So I reversed the syntax of this send sms code from c# to vb net so I can reuse it. The code works sometimes, but for some reason it would often give me the "response received is incomplete" exception. I was thinking perhaps my code is processing commands faster than my GSM device, could handle, so I tried increasing the timeout response for the serial port, still ends up with this ex
所以我将这个发送sms代码的语法从c＃转换为vb net，这样我就可以重用它。 代码有时会起作用，但由于某些原因，它通常会给我“收到的响应不完整”异常。 我想也许我的代码处理命令比我的GSM设备更快，可以处理，所以我试图增加串口的超时响应，但仍然以此异常结束。 你认为什么是问题，你会推荐我做什么来解决它？ Public Class SmsHelper Public receiveNow As AutoResetEvent #Region "Open and Close Ports" 'Open Po
i'm getting an error when i'm trying to update my database Syntax error in UPDATE statement item:In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. error code: -2147217900 errors: {System.Data.OleDb.OleDbErrorCollection} Imports System.Data.OleDb Public Class Ubah_Password Dim kns As New OleDbConnect
当我试图更新我的数据库时出现错误 UPDATE语句项中的语法错误：为了评估索引属性，该属性必须是限定的，并且参数必须由用户明确提供。 错误代码：-2147217900 错误：{System.Data.OleDb.OleDbErrorCollection} 导入System.Data.OleDb 公共类Ubah_Password Dim kns As New OleDbConnection（“provider = microsoft.ace.oledb.15.0; data source =”＆Application.StartupPath＆“ database.accdb”）Dim da As New OleDbDat