我有这段代码：
Imports System
Imports System.IO
Public Class Form1
Public gpath As String = "D:\kvt.txt"
Public Sub New()
' This call is required by the designer.
InitializeComponent()
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim file = System.IO.File.ReadAllLines("d:\kvt.txt")
Dim dt As New DataTable
dt.Columns.Add("Name")
For Each line As String In file
dt.Rows.Add(line)
Next
DataGridView1.DataSource = dt
DataGridView1.Show()
End Sub
Private Sub dataGridView1_MouseClick(ByVal sender As DataGridView, ByVal e As MouseEventArgs) Handles DataGridView1.MouseClick
Dim cMenu As New ContextMenuStrip
Dim MenuItemClone As New System.Windows.Forms.ToolStripMenuItem
MenuItemClone.Text = "Clone"
cMenu.Items.Add(MenuItemClone)
If e.Button = MouseButtons.Right Then
Dim currentMouseOverRow As Integer = DataGridView1.HitTest(e.X, e.Y).RowIndex
cMenu.Show(DataGridView1, New Point(e.X, e.Y))
AddHandler MenuItemClone.Click, AddressOf CloneRepo
End If
End Sub
Private Sub CloneRepo(ByVal sender As Object, ByVal e As System.EventArgs)
Dim SelectedName As String = DataGridView1("Name", DataGridView1.CurrentCell.RowIndex).FormattedValue
End Sub
End Class
这一部分：
export default class AssignmentComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
questions: [],
questionId: this.props.questionId,
pictures: [],
};
this.handleTextSubmit = this.handleTextSubmit.bind(this);
this.assignUserToAssignment = this.assignUserToAssignment.bind(this);
this.handleImageSubmit = this.handleImageSubmit.bind(this);
this.onImageDrop = this.onImageDrop.bind(this);
this.handleImageSubmit = this.handleImageSubmit.bind(this);
}
async componentDidMount() {
const questionsRef = firebase.database().ref('Works').orderByChild('firebaseKey').equalTo(this.props.questionId);
await questionsRef.on('value', snapshot => {
let questions = snapshot.val();
let newState = [];
for (let question in questions) {
newState.push({
id: question,
category: questions[question].category,
level: questions[question].level,
pointAmount: questions[question].pointAmount,
pointBoost: questions[question].pointBoost,
photoURL: questions[question].photoURL,
workText: questions[question].workText,
});
}
try {
this.setState({
questions: newState
});
} catch (e) {
console.log('assignment', e)
}
});
await this.assignUserToAssignment();
}
async assignUserToAssignment() {
var currentUser = firebase.auth().currentUser;
var currentAssignment = firebase.database().ref('Works').child(this.props.questionId);
await currentAssignment.child('available').set(false).catch(e => console.log(e));
await currentAssignment.child('state').set('Taken').catch(e => console.log(e));
await currentAssignment.child('solverID').set(currentUser.uid).catch(e => console.log(e));
await firebase.database().ref('Users').child(currentUser.uid).child('assignedWork').set(this.props.questionId).catch(e => console.log(e));
}
async handleTextSubmit(e) {
e.preventDefault();
var textAnswer = document.getElementById('textAnswer').value;
var currentAssignment = firebase.database().ref('Works').child(this.props.questionId);
if (textAnswer.length > 0) {
let pushRef = currentAssignment.child('answers').push();
pushRef.set({
textAnswer: textAnswer,
date: Time.generate(),
seen: false,
firebaseKey: pushRef.getKey(),
workKey: this.props.questionId
}).catch(e => console.log('push->set', e))
}
}
async onImageDrop(files) {
await this.setState({
uploadedFile: files[0]
});
this.handleImageSubmit(files[0]);
}
async handleImageSubmit(file) {
// Create the file metadata
var metadata = {
contentType: 'image/jpeg'
};
var uploadTask = firebase.storage().ref().child('images/' + Uuid.generate()).put(file, metadata);
var outerThis = this;
uploadTask.on(firebase.storage.TaskEvent.STATE_CHANGED,
function (snapshot) {
var progress = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
console.log('Upload is ' + progress + '% done');
switch (snapshot.state) {
case firebase.storage.TaskState.PAUSED: // or 'paused'
console.log('Upload is paused');
break;
case firebase.storage.TaskState.RUNNING: // or 'running'
console.log('Upload is running');
break;
default:
console.log('test1');
break;
}
}, function (error) {
// A full list of error codes is available at
// https://firebase.google.com/docs/storage/web/handle-errors
switch (error.code) {
case 'storage/unauthorized':
// User doesn't have permission to access the object
break;
case 'storage/canceled':
// User canceled the upload
break;
case 'storage/unknown':
// Unknown error occurred, inspect error.serverResponse
break;
default:
console.log('test2');
break;
}
}, function () {
uploadTask.snapshot.ref.getDownloadURL().then(function (downloadURL) {
console.log('File available at', downloadURL);
var currentAssignment = firebase.database().ref('Works').child(outerThis.props.questionId);
let pushRef = currentAssignment.child('answers').push();
try {
pushRef.set({
downloadURL: downloadURL,
date: Time.generate(),
seen: false,
firebaseKey: pushRef.getKey(),
workKey: outerThis.props.questionId
}).catch(e => console.log('push->set', e));
outerThis.state.setState({
pictures: outerThis.state.pictures.concat(downloadURL),
})
} catch (e) {
console.log('tutej', e)
}
});
});
}
render() {
return (
this.state.questions.map(question => {
return (
<section key={question.id} className='display-question'>
<div className='wrapper show-grid'>
<h3>Kategoria: {question.category}</h3>
<p>Poziom: {question.level}</p>
<p>Punkty: {question.pointAmount + question.pointBoost}</p>
<Col xs={12} md={6}>
<img alt='' style={{width: '100%'}}
src={question.photoURL}/>{/*Need 100% for the ratio*/}
<p>{question.workText}</p>
</Col>
<Col xs={12} md={6}>
<form encType="multipart/form-data" onSubmit={this.handleTextSubmit}>
<textarea name="textAnswer" id="textAnswer" style={{
width: '100%',
height: '50vh',
background: 'white',
color: 'black',
}}/>
<Button type='submit' style={{display: 'block'}}>Wyslij odpowiedz tekstowa</Button>
<Dropzone
multiple={false}
accept="image/*"
onDrop={this.onImageDrop.bind(this)}>
<p>Wyslij zdjecie w odpowiedzi</p>
</Dropzone>
<CancelAnswerButton questionId={question.id}/>
<FinishAnswerButton questionId={question.id}/>
</form>
</Col>
</div>
</section>
)
})
)
}
}
抛出错误说：this.setState({
questions: newState
});
，我不明白，因为语法似乎是为了我。
在我拿出这两个要素后，我开始向南走了：
InvalidCharacterError: String contains an invalid character：
CancelAnswerButton export default class CancelAnswerButton extends React.Component {
constructor(props) {
super(props);
}
async handleCanceling(e) {
try {
e.preventDefault();
var currentAssignment = firebase.database().ref('Works').child(this.props.questionId);
var currentUser = firebase.auth().currentUser;
await currentAssignment.child('available').set(true).catch(e => console.log(e));
await currentAssignment.child('state').set('Waiting').catch(e => console.log(e));
await currentAssignment.child('solverID').remove().catch(e => console.log(e));
await firebase.database().ref('Users').child(currentUser.uid).child('assignedWork').remove().catch(e => console.log(e));
return <AssignmentsComponent/>
// TODO Delete reputation points
}
catch (e) {
console.log('handle', e)
}
}
render() {
try {
return (
<Button onClick={this.handleCanceling} style={{display: 'block'}}>Anuluj
rozwiazywanie
zadan (Odejmujemy
za to pkt z rangi koleszko)</Button>
)
}
catch (e) {
console.log('render', e)
}
}
}
：
FinishAnswerButton但他们看起来都很好。那我错过了什么？
我试图使代码更加模块化，并且仍在学习React，所以可能存在很多问题。
问题对象的示例：
export default class FinishAnswerButton extends React.Component {
constructor(props) {
super(props);
}
async handleFinishAssignment() {
var currentUser = firebase.auth().currentUser;
await firebase.database().ref('Users').child(currentUser.uid).child('assignedWork').remove().catch(e => console.log(e));
var currentAssignment = firebase.database().ref('Works').child(this.props.questionId);
await currentAssignment.child('state').set('Completed').catch(e => console.log(e));
await currentAssignment.child('finishTime').set(Time.generate()).catch(e => console.log('finishTime', e));
return <AssignmentsComponent/>
}
render() {
return (
<Button onClick={this.handleFinishAssignment}>Zakoncz rozwiazywanie zadania (Upewnij
sie ze uczen ma wszystko czego potrzebuje!)</Button>
)
}
}
答案 0 :(得分：0)
杀死并重新启动yarn start进程解决了问题。不知道为什么。如果有人知道或有想法，请随时留下答复/评论