英文:
SignalR in react-native weird thing happens
问题
这是您提供的代码块的翻译部分：
我们在ReactJS中有一个工作应用程序，其中有一个实时聊天部分，用于不同用户之间的通信。在ReactJS中，我们使用@microsoft/signalR，一切都运行正常。以下是代码块：
```javascript
useEffect(() => {
const ConnectionId = "e48950002479" // user.token;
const newConnection = new HubConnectionBuilder()
.withUrl('https://none_of_your_business/chatHub', {
accessTokenFactory: () => ConnectionId
}) //替换为您的SignalR hub的URL
.configureLogging(LogLevel.Debug)
.build();
setConnection(newConnection);
}, [])
useEffect(() => {
if (connection) {
connection
.start()
.then(() => {
console.log("SignalR Connected!");
connection.on("ReceiveMessage", (message) => {
console.log("Received message:", message);
});
})
.catch((error) => console.log(`SignalR Connection error: ${error}`));
}
}, [connection]);
const sendMessage = async () => {
await connection.invoke('SendMessage', "1626659a57c6", "Heyo", "1626659a57c6");
};
然而，当我在React Native中复制相同的代码（使用相同的库）时，它不会发送ConnectionId变量。这真的很奇怪，因为它在ReactJS中运行良好，但在React Native中不起作用。有什么建议吗？
<details>
<summary>英文:</summary>
We have a working application in ReactJS and there is a part which is a real time chat between different users. In reactJs we used @microsoft/signalR and everything works fine. This is the block of code:
useEffect(() => {
const ConnectionId = "e48950002479" // user.token;
const newConnection = new HubConnectionBuilder()
.withUrl('https://none_of_your_business/chatHub', {
accessTokenFactory: () => ConnectionId
}) //replace with the URL of your SignalR hub
.configureLogging(LogLevel.Debug)
.build();
setConnection(newConnection);
}, [])
useEffect(() => {
if (connection) {
connection
.start()
.then(() => {
console.log("SignalR Connected!");
connection.on("ReceiveMessage", (message) => {
console.log("Received message:", message);
});
})
.catch((error) => console.log(`SignalR Connection error: ${error}`));
}
}, [connection]);
const sendMessage = async () => {
await connection.invoke('SendMessage', "1626659a57c6", "Heyo", "1626659a57c6");
};
however when I copied the same code for react-native (with the same library), the thing does not send the ConnectionId variable. It is really weird because it works flawless in reactJS but not in react-native. Any tips?
</details>
# 答案1
**得分**: 1
已解决方法是更改：
```javascript
useEffect(() => {
const ConnectionId = "e48950002479"; // user.token;
const newConnection = new HubConnectionBuilder()
.withUrl('https://none_of_your_business/chatHub?access_token=' + ConnectionId) // 替换为您的 SignalR hub 的 URL
.configureLogging(LogLevel.Debug)
.build();
setConnection(newConnection);
}, [])
英文:
Solved it by changing:
useEffect(() => {
const ConnectionId = "e48950002479" // user.token;
const newConnection = new HubConnectionBuilder()
.withUrl('https://none_of_your_business/chatHub?access_token=' + ConnectionId) //replace with the URL of your SignalR hub
.configureLogging(LogLevel.Debug)
.build();
setConnection(newConnection);
}, [])
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