Dictionary Prices
Suk Harian
I have a Dictionary that contains items and prices. The items are unique but slowly get added and updated through the lifetime of the application (that is, I don't know the item strings in advance). I would like to bind this structure to a DataGridView, so I can show updates on my Form, something like:
Is there a way to achieve this? I need to keep a unique list of items, but also update the price for an existing item, so a Dictionary is the ideal data structure I think, but I cannot find a way to display the data on my Form.
There are a couple of issues with Dictionary; the first is (as you've found) it doesn't implement the necessary IList/IListSource. The second is that there is no guaranteed order to the items (and indeed, no indexer), making random access by index (rather than by key) impossible.
As an extension of Bleiers DictionaryBindingList I made a small alteration to allow Add values to overwrite existing values.I'm using the method with a WAMP websocket so it would allow me to keep values updated just by updating the collection, next I need to tie events onto the values.
If you are talking about a regular dict, then the "first key" doesn't mean anything. The keys are not ordered in any way you can depend on. If you iterate over your dict you will likely not get "banana" as the first thing you see.
Note: You might be tempted to use first, *_ = prices to just get the first key, but I would generally advice against this usage unless the dictionary is very short since it loops over all keys and creating a list for the rest has some overhead.
Everything is a lot faster (CPU is better too, since it's been a few years since the first test). But there have also clearly been optimizations made (see comments for details), especially in first_1.
So I found this page while trying to optimize a thing for taking the only key in a dictionary of known length 1 and returning only the key. The below process was the fastest for all dictionaries I tried up to size 700.
As many others have pointed out there is no first value in a dictionary. The sorting in them is arbitrary and you can't count on the sorting being the same every time you access the dictionary. However if you wanted to print the keys there a couple of ways to it:
When I store data in a dictionary, I typically do it in such a way that it is most useful to iterate over the (key, value) pairs using dict.items. In this case both the key and the value provide meaningful information and I want to use both during the iteration.
Groceries make sense as a dictionary because it seems reasonable to need both the key, i.e. the grocery item such as banana, and the value, i.e. the cost of the bananas. In this question, though you're just totaling the prices, regardless of what the item is. Thus, you don't need the keys, just the values.
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This data dictionary describes columns present in the target price, summary, and beneficiary files that are regularly distributed to hospitals participating in the CMS Comprehensive Care for Joint Replacement (CJR) model. Each table in this file describes columns present in one of the files contained in the zip file distributed to participating CJR hospitals.
The variable labeled EPI_ID acts as a key to uniquely identify CJR episodes. As of January 2017, the structure of the EPI_ID variable is changing to an 18-digit alphanumeric field. The first two digits indicate the model (CJR is code 75), and the final 16 digits are a randomly-assigned hexidecimal number. Beginning with the January 2017 data update, the EPI_ID value will consistently identify the same episode in all future data files (i.e., EPI_ID will uniquely identify CJR episodes both within the same update of data files and across future updates). To link episodes from the January 2017 data update onward to those from the previously delivered files, use the intersection of the three variables BENE_SK, ANCHOR_BEG_DT, and CCN as a unique key.
Dollar values listed in these files are either "raw dollars," meaning actual dollar amounts paid or collected, or "standardized dollars," meaning dollar amounts that exclude geographic and other localized payment adjustments. The first category describes the so-called "allowed payments," which are actual payments on Medicare including copays, deductibles, and amounts paid by secondary payers.
The files are in comma-separated value (CSV) format, though not all are named with a ".CSV" extension to the file name. Each CSV file is a plain-text, ASCII-formatted (using Windows codepage 1252) file which represents a structured table of data. They can be read natively by many data-analysis programs and spreadsheet applications (for example, Microsoft Excel). The remainder of this section is dedicated to describing the specifics of the CSV file format used for the distributed data. This section can be skipped unless the details of the file format are needed to write a custom file reader for analysis purposes.
Each line of a CSV file represents one row of the table, and is terminated by a carriage-return and line feed character combination (ASCII character codes 13 "carriage return" and 10 "line feed", respectively). Rows are separated into columns by comma characters (ASCII character code 44 "comma"). Whitespace before and after the column-separating comma characters are ignored, but whitespace characters present between non-whitespace characters within a value are not ignored.
In rare cases when a value within the table contains a comma character (for instance, the name of a hospital), the entire value will be enclosed in quotation marks (ASCII character code 34 "quotation mark") which are not to be construed as a part of the value. In rare cases when a value within the table contains a quotation mark character or backslash character (ASCII character codes 34 "quotation mark" and 92 "reverse solidus", respectively), these characters will be preceeded by a backslash character. The initial backslash character is not to be construed as part of the value.
This file contains information about LEJR episodes where the beneficiary isassigned to one of the following ACO models or program: the Pioneer ACO model,Next Generation ACO model, Medicare Shared Savings Program, or the ComprehensiveESRD Care Initiative.
This file contains information about dual-eligibile beneficiaries (those qualifiedto receive both Medicaid and Medicare benefits). The number of rows in thisfile is equal to the number of dual-elegible beneficiaries who received CJRservices listed in other files.
The beneficiary cross-reference (BXREF) file is used to cross-referencebeneficiary IDs (BENE_SK). When CMS updates a BENE_SK, it is reflected in allclaims and enrollment files; however, the NCBP file is not updated like otherclaims files, so NCBP payments remain indexed by previous BENE_SK values insome instances.
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