c# - Save data in 2d dictionary? -

c# - Save data in 2d dictionary? -

what fastest way store info dictionary<string, int[][]> , dictionary<int, dictionary<string, string> file, later can imported , converted variables?

currently, utilize code (this dictionary<string, int[][]>):

string savestring = ""; int = 0; foreach (keyvaluepair<string, int[][]> entry in data) { if (i > 0) savestring += "|"; savestring += entry.key + ":"; int j = 0; foreach (int[] x in entry.value) { if (j > 0) savestring += ";"; int k = 0; foreach (int y in x) { if (k > 0) savestring += ","; savestring += y; k++; } j++; } i++; } string dir = path.combine(directory.getcurrentdirectory(), config.savedirectory, config.savename); if (!directory.exists(dir)) { directory.createdirectory(dir); } file.writealltext(path.combine(dir, "data.txt"), savestring);

and although works, slow (and doesn't either).

what work better?

you're not looking @ place. problem not storing data, it's getting data.

with example, low 50 entries of int[30][30] (~91600 string concatenations if looked correctly), take 6600ms! no storing involved, concatenation part. problem is, each time you're appending string, need start @ 0 , go all way end, wasting lot of time.

you can read schlemiel painter's algorithm joel spolsky larn more phenomenon.

to prepare this, utilize stringbuilder, it's made these utilize cases. same dataset, speeds operation 6600ms 6ms.

so initial example, stringbuilder:

stringbuilder savestring = new stringbuilder(); int = 0; foreach (keyvaluepair<string, int[][]> entry in data) { if (i > 0) savestring.append("|"); savestring.append(":"); int j = 0; foreach (int[] x in entry.value) { if (j > 0) savestring.append(";"); int k = 0; foreach (int y in x) { if (k > 0) savestring.append(","); savestring.append(y); k++; } j++; } i++; } string dir = path.combine(directory.getcurrentdirectory(), config.savedirectory, config.savename); if (!directory.exists(dir)) { directory.createdirectory(dir); } file.writealltext(path.combine(dir, "data.txt"), savestring.tostring());

c# linq dictionary