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NullableTypes examples

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This commit is contained in:
Tommy Öman
2019-01-06 14:44:58 +01:00
parent ba2e475f5b
commit 81833c686b
5 changed files with 151 additions and 0 deletions
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6
Nullable_types/App.config Normal file
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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
</startup>
</configuration>

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Nullable_types/Nullable_types.csproj Normal file
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<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{9192B9D9-88CD-4A3D-B586-4DA40F0A36B8}</ProjectGuid>
<OutputType>Exe</OutputType>
<RootNamespace>Nullable_types</RootNamespace>
<AssemblyName>Nullable_types</AssemblyName>
<TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
<Deterministic>true</Deterministic>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>

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Nullable_types/Program.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Nullable_types
{
class Program
{
static void Main(string[] args)
{
//DateTime date = null; //datetime is nott nullable
Nullable<DateTime> ndate = null;
DateTime? nullable_date = null;
/*
Console.WriteLine("GetValueOrDefault(): " + nullable_date.GetValueOrDefault());
Console.WriteLine("HasValue: " + nullable_date.HasValue);
Console.WriteLine("Value: " + nullable_date.Value);
*/
nullable_date = new DateTime(2014, 1, 1);
//DateTime date2 = nullable_date;
DateTime date2 = nullable_date.GetValueOrDefault();
DateTime? date3 = date2;
Console.WriteLine(date2);
Console.WriteLine(date3.GetValueOrDefault());
DateTime date4;
//Method 1
if (nullable_date != null)
date4 = nullable_date.GetValueOrDefault();
else
date4 = DateTime.Today;
Console.WriteLine(date4);
//Method 2
DateTime date5 = nullable_date ?? DateTime.Today;
Console.WriteLine(date5);
DateTime date6 = (nullable_date != null) ? nullable_date.GetValueOrDefault() : DateTime.Today;
Console.WriteLine(date6);
}
}
}

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Nullable_types/Properties/AssemblyInfo.cs Normal file
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using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("Nullable_types")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("Nullable_types")]
[assembly: AssemblyCopyright("Copyright © 2019")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("9192b9d9-88cd-4a3d-b586-4da40f0a36b8")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]