key-value

I have an object of the type IEnumerable<KeyValuePair<T,U>> keyValueList , I am using var getResult= keyValueList.SingleOrDefault(); if(getResult==/*default */) { } else { } How can I check whether getResult is the default, in case I can't find the correct element? I can't check whether it is null or not, because KeyValuePair is a struct. Try this: if (getResult.Equals(new KeyValuePair<T,U>())) or this: if (getResult.Equals(default(KeyValuePair<T,U>))) pholpar You can create a general (and generic) extension method, like this one: public static class Extensions { public static bool IsDefault<T

Pseudo example: <Window> <Window.Tag> <x:Dictionary KeyType="{x:Type sys:String}" ValueType="{x:Type sys:Int32}"> <sys:DictionaryEntry Entry="{sys:DictionaryEntry Key0, 000}"/> <sys:DictionaryEntry Key="key1" Value="111"/> <sys:DictionaryEntry> <sys:DictionaryEntry.Key> <sys:String>Key2<sys:String> </sys:DictionaryEntry.Key> <sys:DictionaryEntry.Value> <sys:Int32>222</sys:Int32> </sys:DictionaryEntry.Value> </sys:DictionaryEntry> </x:Dictionary /> </Window.Tag> </Window> Thomas Levesque You can't use the Dictionary<TKey, TValue> class directly in XAML, because there's no way to specify the

I need help getting two values (for human friendly dropdown) in a key-value pair using find or get or anything else. I need help with the simplest method of doing this in CakePHP. Here's my attempt: in my controller $users = $this->LocationsUser->Users->find('list', [ 'limit' => 1, 'keyField' => 'id', 'valueField' => ['first_name', 'last_name'] ])->where(['id' => $id]); In my view echo $this->Form->input('user_id', [ 'options' => $users, 'type' => 'select', 'multiple' => false, ]); The result on my drop-down: <option value="10">Fabian;Pankiers</option> See I need a result without the semicolon

I have an extremely large JSON object structured like this: {A : 1, B : 2, C : 3, D : 4} I need a function that can swap the values with keys in my object and I don't know how to do it. I would need an output like this: {1 : A, 2 : B, 3 : C, 4 : D} Is there any way that I can do this would manually created a new object where everything is swapped? Thanks jPO function swap(json){ var ret = {}; for(var key in json){ ret[json[key]] = key; } return ret; } Example here FIDDLE don't forget to turn on your console to see the results. ES6 version: static objectFlip(obj) { const ret = {}; Object.keys

static void setFieldValue(Map<String,Object> maps,Object obj){ if (maps != null){ Iterator keys = maps.keySet().iterator() while(keys.hasNext()){ String key = (String)keys.next() String value = maps.get(key) try{ Field field = obj.getClass().getDeclaredField(key) field.setAccessible(true) field.set(obj, field.getType().getConstructor(field.getType()).newInstance(value)) }catch(Exception e){ } } } } 来源： https://www.cnblogs.com/xiaoyutongxue/p/11361481.html