};// ⛔️ Error: Property 'then' does not// exist on type 'void'.ts(2339)getPromise().then((value) =>{console.log(value); }); getPromise函数不返回值,因此 TypeScript 将其返回类型设置为void。 // 👇️ const getPromise: () => voidconstgetPromise= () => {Promise.resolve(42...
{ ReactNode, useState } from 'react' import { User } from 'screens/project-list/search-panel' interface AuthForm { username: string, password: string } const AuthContext = React.createContext< { user: User|null, register: (form: AuthForm) => Promise<void>, login: (form: AuthForm) ...
I use HTMLAudioElement to play audio. But when I 'npm start' or 'ng build ..', there is a problem. "Property 'then' does not exist on type 'void'." Please help me. Code below (https://googlechrome.github.io/samples/play-return-promise/): ...
//Type 'string' is not assignable to type 'number'. } } 获取器/设置器 类也可以有访问器: class C { _length = 0; get length() { return this._length; } set length(value) { this._length = value; } } 请注意,没有额外逻辑的由字段支持的 get/set 对在 JavaScript 中很少有用。 如果...
The file does not exist. -or- The Length property is called for a directory. Examples The following example displays the size of the specified files. C# Copy // The following example displays the names and sizes // of the files in the specified directory. using System; using System.IO;...
protectedoverridevoidOnSetComplete(intindex,object? oldValue,object? newValue); 参数 index Int32 从零开始的索引,可在该位置找到oldValue。 oldValue Object 要用newValue替换的值。 newValue Object index处的元素的新值。 适用于 产品版本 .NET Framework1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5....
Timeout15The length of time (in seconds) to wait for a connection to the server before terminating the attempt and generating an error. Valid values are greater than or equal to 0 and less than or equal to 2147483647. When opening a connection to a Azure SQL Database, set the connection...
args.Length; ctr++) tasks.Add(GetFileLengthsAsync(args[ctr]));try{ Task.WaitAll(tasks.ToArray()); }// Ignore exceptions here.catch (AggregateException) {}for(intctr =0; ctr < tasks.Count; ctr++) {if(tasks[ctr].Status == TaskStatus.Faulted) Console.WriteLine("{0} does not exist"...
Additionally, you can set default values by setting an array called$defaultMetaValueson the model. Setting default has two side effects: If a meta attribute does not exist, the default value will be returned instead ofnull. if you attempt to set a meta attribute to the default value, the ...
.NET Regular Expression for Comma separated list of numbers with 8 digit length 'Access to the path 'F:\System Volume Information' is denied.'? 'Color' Assembly reference error 'object' does not contain a definition for 'Text' and no accessible extension method 'Text' accepting a first argu...