nullable

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Handling DateTime? in NHibernate/LINQ queries

this is a follow-up to question Better DateTime? or use default(DateTime) for NULL? I tried to implement a simple query that works with DateTime? with a different example rather than the one of the o[详细]

2023-02-07 22:08 分类：问答
Working with Nullable types in C#

I have Nullable properties defined in my class which take part in calculations and xml writing. As you all know, when any null value takes part in a calculation, the result is always null. I will expl[详细]

2023-02-07 11:47 分类：问答
Nullable bool fields in MS Access linked tables

Looks like I\'m not the only one out there with this issue, but there doesn\'t seem to be an anwwer to this problem.[详细]

2023-02-05 20:56 分类：问答
Nullable<> types are a BCL, CLR, or both implementation?

Some time ago I thought that Nullable<> value types are classes, encapsulating value types and a bool to HasValue. With som开发者_开发技巧e implicit cast operador for null, just implemented at BCL.[详细]

2023-02-05 05:24 分类：问答
Property or indexer 'System.Nullable.Value' cannot be assigned to -- it is read only

I\'m developing an winform app. Based of some values (say x) I want to show user an alert, a timer updated other value (y), which affect x, and check for value of x and show alert to user.[详细]

2023-02-03 19:19 分类：问答
Nullable<T> for generic method in c#?

How can I write a generic method that can take a Nullable object to use as an extension method.I want to add an开发者_StackOverflow中文版 XElement to a parent element, but only if the value to be used[详细]

2023-01-31 22:49 分类：问答
Whats the use of Nullable.GetUnderlyingType, if typeof(int?) is an Int32?

why is typeof int? an Int32 int? x = 1; Console.WriteLine(x.GetType().Name); If it is okay then what\'s the use 开发者_StackOverflow中文版of Nullable.GetUnderlyingType?Calling GetType() boxes your[详细]

2023-01-31 18:33 分类：问答
passing a null datetime to reportparameter class?

How can I put a null value on datetime variable type? I tried to make it nullable value, but I need to use it in ReportParameter() method to send it to my report b开发者_如何学编程ut ReportParameter([详细]

2023-01-30 05:40 分类：问答
Why does >= return false when == returns true for null values?

I have two variables of type int? (or Nullable<int> if you will). I wanted to do a greater-than-or-equal (>=) comparison on the two variables but as it turns out, this returns false if both vari[详细]

2023-01-29 12:05 分类：问答
Default value of nullable integer different in If() function

I am trying to understand why the two code samples behave differently. I always believed the If() function to mimic the If language fea开发者_JS百科ture. Or am I looking at a behavior of Nullable(Of I[详细]

2023-01-29 03:39 分类：问答