c# - Given two dictionaries, how do you overwrite matching items in one with items in the other, leaving the remaining items untouched -

here starting code:

dictionary<string,object> dest=...; idictionary<string,object> source=...;  // overwrite in dest of items appear in source new values // in source. new items in source not appear in dest should added. // existing items in dest, not in source should retain current  // values. ... 

i can foreach loop goes through of items in source, there shorthand way in c# 4.0 (perhaps linq)?

thanks

the foreach pretty small. why complicate things?

foreach(var src in source) {     dest[src.key] = src.value; } 

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if you're going repeat often, write extension method:

public static void mergewith<tkey, tvalue>(this dictionary<tkey,tvalue> dest, idictionary<tkey, tvalue> source) {     foreach(var src in source)     {         dest[src.key] = src.value;     } }  //usage: dest.mergewith(source); 

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as doing "with linq", query part means linq method should have no side effects. having side effects confusing of expect no side effects it.