nullable

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How to set enum to null

I have an enum string name; public enum Color { Red, Green, Yellow } How to set it to NULL on load. name = \"\";[详细]

2023-01-29 01:34 分类：问答
AND operation cannot be applied between nullable bools

I am applying AND operation (&&) between two nullable boolean (bool?) but it is giving me error that[详细]

2023-01-28 01:35 分类：问答
double? to decimal? conversion

Why after this code fragment: double? d = 123.4; decimal? dec = (decimal?)d; //dec is null is dec\'s v开发者_StackOverflow中文版alue null?I\'ve tested on .NET 2.0 and .NET 4.0, and I get dec as 1[详细]

2023-01-26 16:48 分类：问答
How to ensure a boolean field to be set in Grails?

I want to ensure that one of two form fields representing a boolean value is checked. But there is no appropriate constraint to do this. nullable: false does not work.[详细]

2023-01-25 23:34 分类：问答
VB.NET - Nullable DateTime and Ternary Operator

I\'m having problems with a Nullable DateTime in V开发者_运维知识库B.NET (VS 2010). Method 1 If String.IsNullOrEmpty(LastCalibrationDateTextBox.Text) Then[详细]

2023-01-25 10:31 分类：问答
What does ?? mean in C#? [duplicate]

This question already has answers here: Closed 12 years ago. Possible Duplicate: What do two question marks together mean in C#?[详细]

2023-01-25 07:53 分类：问答
Populating a Nullable type from a DataRow

I want to get a value from an item in a DataRow and I would like to store the result in a Nullable Date field.[详细]

2023-01-24 10:00 分类：问答
VB.NET Extension on Nullable(Of T) object, gives type error

The code I want to work: <Extension()> Public Function NValue(Of T)(ByVal value As Nullable(Of T), ByVal DefaultValue As T) As T[详细]

2023-01-22 19:03 分类：问答
How do I use the strongly-typed HTML helpers with nullable types?

I want to use the strongly-typed HTML helpers in ASP.NET MVC 2 with a property of my model which is Nullable<T>.[详细]

2023-01-22 15:56 分类：问答
Generating Entity Framework based on Views: Nullable types

Some of the properties in a class generated by EF are nullable, and some arent. My first instinct was that this should be driven by Nullable property returned by sp_help MyView. But that doesn\'t se[详细]

2023-01-22 01:28 分类：问答