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Type Checking: typeof, GetType, or is?
...s Foo)
Foo foo = (Foo)obj;
requires two.
Update (Jan 2020):
As of C# 7+, you can now cast inline, so the 'is' approach can now be done in one cast as well.
Example:
if(obj is Foo newLocalFoo)
{
// For example, you can now reference 'newLocalFoo' in this local scope
Console.WriteL...
A field initializer cannot reference the nonstatic field, method, or property
...
No, the compiler cannot rearrange the initializers. The C# Language Specification states, under the section "10.5.5.2 Instance field initialization", the following: The variable initializers are executed in the textual order in which they appear in the class declaration. This is e...
Prompt Dialog in Windows Forms
...
Add reference to Microsoft.VisualBasic and use this into your C# code:
string input = Microsoft.VisualBasic.Interaction.InputBox("Prompt",
"Title",
"Default",
0,
0);
To add the refernce: r...
How to have an auto incrementing version number (Visual Studio)? [duplicate]
...Version and AssemblyFileVersion attributes:
<#@ template language="C#" #>
//
// This code was generated by a tool. Any changes made manually will be lost
// the next time this code is regenerated.
//
using System.Reflection;
[assembly: AssemblyVersion("1.0.1.<#= this.RevisionNumber...
FirstOrDefault: Default value other than null
...; set;}
}
void Main()
{
var list = new List<Foo>();
//before C# 6.0
string barCSharp5 = list.DefaultIfEmpty(new Foo()).FirstOrDefault().Bar;
//C# 6.0 or later
var barCSharp6 = list.FirstOrDefault()?.Bar;
}
For C# 6.0 or later:
Use ?. or ?[ to test if is null before perfo...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" //背景颜色}); App Inventor 2 中文网 © 2023 - document.write(new Date().getFullYear()); 跟着学（上海）教育科技有限公司 ...
Java Interfaces/Implementation naming convention [duplicate]
...IService and Service for a single implementation which is really common in c# stackoverflow.com/questions/681700/interface-naming-convention
– amdev
Jan 21 '19 at 21:11
...
List passed by ref - help me explain this behaviour
...ect created on heap. The variable myList is a
reference to that object.
In C# you never pass objects, you pass their references by value.
When you access the list object via the passed reference in
ChangeList (while sorting, for example) the original list is changed.
The assignment on the ChangeList...
Are there strongly-typed collections in Objective-C?
I'm new to Mac/iPhone programming and Objective-C. In C# and Java we have "generics", collection classes whose members can only be of the type declared. For example, in C#
...
Do zombies exist … in .NET?
...tead, or putting the release in a finally block.
See also
Subtleties of C# IL
codegen
for a very subtle case where an exception can prevent a lock from
being released even when using the lock keyword (but only in .Net 3.5 and earlier)
Locks and exceptions do not
mix
...