keynotfoundexception | 易学教程

CRM 2011 KeyNotFoundException exception

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问题 I am new to CRM development. I have a Custom Entity "customer". This Entity has a Field called "defaultcustomer", which can be TRUE or FALSE. I am working on a Plug-In where i need to set the "defaultcustomer" to FALSE for all the "Customers". I am doing it as below: FACTS: I have registered the plugin for the entity "customer" itself. So when the Entity "customer" is updated, the plugin fires. private void MakeAllNonDefault() { try { QueryExpression query = new QueryExpression("customer");

Should I throw a KeyNotFoundException for a database lookup? [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . I've got some code that, given an ID, returns an item from the database. If no item matches the given ID, is it appropriate to throw a KeyNotFoundException, or are such exceptions meant only for Dictionary types? 回答1: Depending on the framework you're using to access the

Best way to handle a KeyNotFoundException

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问题 I am using a dictionary to perform lookups for a program I am working on. I run a bunch of keys through the dictionary, and I expect some keys to not have a value. I catch the KeyNotFoundException right where it occurs, and absorb it. All other exceptions will propagate to the top. Is this the best way to handle this? Or should I use a different lookup? The dictionary uses an int as its key, and a custom class as its value. 回答1: Use Dictionary.TryGetValue instead: Dictionary<int,string>

Best way to handle a KeyNotFoundException

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I am using a dictionary to perform lookups for a program I am working on. I run a bunch of keys through the dictionary, and I expect some keys to not have a value. I catch the KeyNotFoundException right where it occurs, and absorb it. All other exceptions will propagate to the top. Is this the best way to handle this? Or should I use a different lookup? The dictionary uses an int as its key, and a custom class as its value. Jon Skeet Use Dictionary.TryGetValue instead: Dictionary<int,string> dictionary = new Dictionary<int,string>(); int key = 0; dictionary[key] = "Yes"; string value; if

CRM 2011 KeyNotFoundException exception

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I am new to CRM development. I have a Custom Entity "customer". This Entity has a Field called "defaultcustomer", which can be TRUE or FALSE. I am working on a Plug-In where i need to set the "defaultcustomer" to FALSE for all the "Customers". I am doing it as below: FACTS: I have registered the plugin for the entity "customer" itself. So when the Entity "customer" is updated, the plugin fires. private void MakeAllNonDefault() { try { QueryExpression query = new QueryExpression("customer"); query.ColumnSet = new ColumnSet("defaultcustomer"); EntityCollection retrieved = service

Which mechanism is a better way to extend Dictionary to deal with missing keys and why?

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问题 There is a minor annoyance I find myself with a lot - I have a Dictionary<TKey, TValue> that contains values that may or may not be there. So normal behaviour would be to use the indexer, like this: object result = myDictionary["key"]; However, if "key" is not in the dictionary this throws a KeyNotFoundException , so you do this instead: object val; if (!myDictionary.TryGetValue("key", out val)) { val = ifNotFound; } Which is fine, except that I can have a load of these in a row - TryGetValue

KeyNotFoundException in filled dictionary

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I am trying to modify value in dictionary, but the compiler throws KeyNotFoundException . I'm sure, I declared that key in dictionary, because I am calling GenerateEmptyChunks() method, which fills dictionary with chunks with key of their position and values are empty for level generator. I've checked debugger and Chunks dictionary object is correctly filled with keys and values. Is it caused by my unworking CompareTo method? If yes, how I have modify CompareTo method to return right values? public Dictionary<WPoint, WChunk> Chunks = new Dictionary<WPoint, WChunk>(); GenerateEmptyChunks()

KeyNotFoundException in filled dictionary

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问题 I am trying to modify value in dictionary, but the compiler throws KeyNotFoundException . I'm sure, I declared that key in dictionary, because I am calling GenerateEmptyChunks() method, which fills dictionary with chunks with key of their position and values are empty for level generator. I've checked debugger and Chunks dictionary object is correctly filled with keys and values. Is it caused by my unworking CompareTo method? If yes, how I have modify CompareTo method to return right values?