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英文字典中文字典相关资料:


  • Is there a better way to use C# dictionaries than TryGetValue?
    The TryGetValue() construct is only necessary if you don't know whether "key" is present as a key within the dictionary or not, otherwise DoSomethingWith(dict["key"]) is perfectly valid A "less dirty" approach might be to use ContainsKey() as a check instead
  • C# 8 non-nullable references and the Try pattern
    There is a pattern in C# classes exemplified by Dictionary TryGetValue and int TryParse: a method that returns a boolean indicating success of an operation and an out parameter containing the actual result; if the operation fails, the out parameter is set to null
  • c# - Return magic value, throw exception or return false on failure . . .
    Dictionary<,> Item throws KeyNotFoundException, Double Parse throws FormatException; or; return false and provide the actual return value in an out parameter: Dictionary<,> TryGetValue, Double TryParse Note that as Hashtable was created in the time when there were no generics in C#, it uses object and can therefore return null as a magic
  • Efficiency of C# dictionaries - Software Engineering Stack Exchange
    The Dictionary generic class provides a mapping from a set of keys to a set of values Each addition to the dictionary consists of a value and its associated key Retrieving a value by using its key is very fast, close to O(1), because the Dictionary class is implemented as a hash table And there we have it It's a hash table Note that I've
  • c# - Should we abandon the if not null pattern? - Software . . .
    I've seen that with the Dictionary API now has methods with bool TryGetValue<TKey, TValue>(TKey key, out TValue value) and I like this kind of methods because they're signaling to the other devs that you must not check the value but the output of the Try method And now that I've seen this I've a tendency to this for my own methods
  • c# - Why does IDictionary not implement IReadOnlyDictionary - Software . . .
    Mutable collection interfaces in C# do not extend their readonly counterparts because: At the time that C# was initially laid down, the benefits of immutability were not widely understood, and therefore the benefits of readonlyness were also not widely understood So, the first versions of the language had mutable interfaces but not readonly ones
  • Dictionary of dictionaries design in C# - Software Engineering Stack . . .
    I am thinking about creating a ConcurrentDictionary of Dictionarys (or perhaps of ConcurrentDictionarys), and this would require some more extension methods I sort of thought if I'm using it this much that I should just create the darn class and be done with it
  • object oriented - How do you fix the wrong-case-sensitivity dictionary . . .
    public System Collections Generic Dictionary<string, object> Properties { get; set; } We might want to use it like a plain old data class So, we can deserialize JSON or SQL rows or whatever, to fill in the properties dictionary By seemingly good luck, our JSON serializer understands the dictionary type and can do that pretty well
  • coding standards - Software Engineering Stack Exchange
    Let's compare it to Net C# Dictionary<T,U>'s TryGetValue method: public bool TryGetValue( TKey key, out TValue value ) It is the same pattern as yours, and it is there for performance reason because without this method the code must be
  • c# - Alternative To Generic Methods where Type is known at runtime . . .
    A static non-generic utility with a dictionary of those The idea is that the interface will have non-generic versions of the methods you want to call And we will use the utility to get an object that implement the interface passing passes the generic parameter we want





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