ref

问题 I am unable to setup WSO2 Identity Server v5.6.0 with OpenLDAP as primary, external user store. The Identity Server is starting as expected (no errors in the console) and the admin user account has been created automatically, too. But if I try to add A new User per management console, the Identity Server throws the following error: Could not add user PRIMARY/johndoe@gmail.com. Error: Cannot access the directory context or user already exists in the system for user :johndoe@gmail.com In the

问题 i am new to this language. In order to try and understand referencing i have tried implementing a simple directed list the freshman college computer science way. type item = { value:float next:ref<item> } type list() = let head:ref<item> = null // tried instantiation so many different ways and it likes none of em let sum i = if i == null then 0 else i.value + sum i.next // constructor not defined? Please tell me why im bad at this 回答1: First of all you try to implement it in some imperative

问题 How can i pass a list which is a list of DerivedObjects where the Method is expecting a list of BaseObjects. I am converting the list .ToList<BaseClass>() and am wondering if there is a better way. My second problem is the syntax is incorrect. I am trying to pass the list byref and i am getting an error: 'ref' argument is not classified as a variable How can I fix these two problem? thanks. public class BaseClass { } public class DerivedClass : BaseClass { } class Program { static void Main

问题 Ok, I'm doing my lab from C# class which involve using ref parameters, arrays, and methods. There is a few problems which I encounter while doing this and I'm begging for help. So.. First I modified problem into simplest chunks to help me explain which problems I have. Here is a piece of simplified code: using System; public class Repository { string[] titles; static void Main(string[] args) { string title; Console.Write("Title of book: "); title = Console.ReadLine(); getBookInfo(ref title);

问题 I found some code in our app that passes a List<T> by reference to indicate it is modified: void DoSomething(ref List<MyType> theList) { theList.Add(new MyType()); } I think it is clear that the ref-keyword is obsolete in this case, as we could also add new elements to the list without the keyword. However it indicates that we modify the lists or at least its elements. I find this is particulary useful if you have many parameters and want to see which of them are modified and which are just

问题 I've imported a custom component into my screen and rendered it in the render() function. Then, created a ref to that custom component. Now, the render() function simply looks like this. render() { return ( <View> <MyComponent ref={component => this.myComponent1 = component} /> <MyComponent ref={component => this.myComponent2 = component} /> <MyComponent ref={component => this.myComponent3 = component} /> </View> ) } Then, In the same screen file, I've created another function to access the

问题 Why is this.workmin.value undefined? captureInput=(text)=>{ console.log('captureinput',this.refs.workmin.value) } render() { console.log('RENDER',this.state) return ( <View style={styles.container}> <Text style={styles.bigFont}>{`${this.state.timer + 'TIMER'}`}</Text> <Text style={styles.bigFont}>{`${this.state.min + ':' + this.state.sec}`}</Text> <View style={styles.button}> <Button title='START' onPress={()=>this.startToggle()} /> <Button title='RESET' onPress={()=>this.resetToggle()} /> <

问题 I have some variables which were given through ref keyword in my function. I want to use ref-variables in lambda expression without using local variables exactly. I know that C# can't merge lambdas and ref-variables in work. But doesn't exist any perversion to make ref-variables work in lambda-expression? Pseudo-code (wanna-be C#) : T MyFunction<T>(ref T x, ref T y) { return (Func<T>) ( () => ( (100 * (x - y)) / x ) (); } I want it: 1). Be generic. 2). Accept as arguments the generic-types by

问题 I have two components in react native and I'm unable to close a modal from my child component. ListTrips - Parent ModalAddTrip - Child ListTrips.js import ModalAddTrip from './ModalAddTrip'; .... .... this.state = { isModalAddTripVisible: false } .... handleDismissModalAddTrip = () => { this.setState({ isModalAddTripVisible: false }); }; closeModal() { this.refs.ModalAdd.handleDismissModalAddTrip(); } .... <ModalAddTrip ref="ModalAdd" isVisible={this.state.isModalAddTripVisible}

问题 I want to call with reflection each Method of an Class but I cant call Methods with an pointer as Reference. Normally I just could pass null for each pointer I find and everything would be fine. The Problem is when the function trys to access my passed pointer. The pointer would be an reference to the memory address 0 and that is obviously an instant crash for my Program. So I need to pass an pointer to an valid memory adress, but I dont know how I can create an pointer during runtime A