Question

我试图完成一项简单的任务，从另一个帖子更新表单中的进度条，经过4个多小时左右的googleing，我仍然无法掌握它...到目前为止，这是我的代码，我错了？任何人都能指出我正确的方向吗？

namespace ImageLoader
{
    public partial class Form1 : Form
    {
        BackgroundWorker bgw = new BackgroundWorker();
        public Form1()
        {
            InitializeComponent();
            bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
            bgw.ProgressChanged += new ProgressChangedEventHandler(bgw_ProgressChanged);
            bgw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgw_RunWorkerCompleted);
            bgw.WorkerReportsProgress = true;
        }
        private void button1_Click(object sender, EventArgs e)
        {

            bgw.RunWorkerAsync();
        }
        void bgw_DoWork(object sender, DoWorkEventArgs e)
        {

            Excel.Worksheet activeWorksheet = ((Excel.Worksheet)Globals.ThisAddIn.Application.ActiveSheet);
            bool test = false;
            bool testStr = false;
            int urlsColPos = 0;
            int imgColPos = 0;
            object result;
            object result2;
            result = textBox1.Text;
            result2 = textBox2.Text;
            string urlValidi = "http";
            if (result == "" || result2 == "")
            {
                MessageBox.Show("Uno dei due campi non è stato valorizzato, compilare entrambi i campi prima di continuare.");
                test = false;
            }
            else
            {
                urlsColPos = char.ToUpper(Convert.ToChar(result)) - 64;
                imgColPos = char.ToUpper(Convert.ToChar(result2)) - 64;
                var s1 = (activeWorksheet.Cells[2, urlsColPos] as Excel.Range).Value.ToString();
                var s2 = (activeWorksheet.Cells[2, imgColPos] as Excel.Range).Value;
                testStr = s1.Contains(urlValidi);
                if (testStr == false)
                {
                    MessageBox.Show("La colonna specificata per l'origine URLs non contiene URL validi");
                }
                if (s2 != null)
                {
                    MessageBox.Show("La colonna dove inserire le immagini non è vuota");
                }
                if (testStr == true && s2 == null)
                {
                    test = true;
                }
            }
            if (test == true)
            {
                HttpWebResponse response = null;
                Excel.Range range = activeWorksheet.UsedRange;
                double lastRow = range.Rows.Count;
                activeWorksheet.Rows.RowHeight = 62;
                activeWorksheet.Columns.ColumnWidth = 12;
                for (var i = 2; i <= lastRow; i++)
                {
                    Application.DoEvents();
                    Microsoft.Office.Interop.Excel.Range oRange = (Microsoft.Office.Interop.Excel.Range)activeWorksheet.Cells[i, imgColPos];
                    //const float ImageSize = 45;
                    float Left = (float)((double)oRange.Left + 2);
                    float Top = (float)((double)oRange.Top + 1);
                    var imgUrl = (string)(activeWorksheet.Cells[i, urlsColPos] as Excel.Range).Value;
                    int ultimaRiga = (int)lastRow;
                    int percents = (i * 100) / ultimaRiga;
                    //progressBar1.Step = 1;
                    //progressBar1.Value = i;
                    bgw.ReportProgress(percents, i);
                    try
                    {
                        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(imgUrl);
                        request.Method = "GET";
                        response = (HttpWebResponse)request.GetResponse();
                        StreamReader sr = new StreamReader(response.GetResponseStream());
                        byte[] imgData = new WebClient().DownloadData(imgUrl);
                        MemoryStream imgStream = new MemoryStream(imgData);
                        Image img = Image.FromStream(imgStream);
                        float wSize = img.Width;
                        float hSize = img.Height;
                        if (hSize > wSize) //Verticale
                        {
                            activeWorksheet.Shapes.AddPicture(imgUrl, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, Left + 14, Top, 40, 60);
                        }
                        else
                        {
                            activeWorksheet.Shapes.AddPicture(imgUrl, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, Left + 3, Top + 10, 60, 40);
                        }
                        Application.DoEvents();

                        //Console.Write(sr.ReadToEnd());

                    }
                    catch (WebException f)
                    {
                        activeWorksheet.Cells[i, 10] = "Errore Server Remoto Nuxie";
                    }
                    finally
                    {
                        response.Close();
                    }


                }
                this.Close();
            }
        }
        void bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;

        }
        void bgw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            return;
        }
    }
}

Answer 1

显然有一些错误可能会产生交叉线程问题。

例如，您不需要使用package complete.lyne.myapplication; import android.content.Context; import android.content.Intent; import android.graphics.BitmapFactory; import android.graphics.Color; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.AsyncTask; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.io.IOException; // import br.com.simplepass.loading_button_lib.customViews.CircularProgressButton; public class Login extends AppCompatActivity { EditText loginEmail, loginSenha; Button btLogar; TextView refCadastrar; String url = ""; String parametro = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); loginEmail = (EditText)findViewById(R.id.loginEmail); loginSenha = (EditText)findViewById(R.id.loginSenha); btLogar = (Button)findViewById(R.id.btLogar); refCadastrar = (TextView)findViewById(R.id.refCadastrar); refCadastrar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent abreCadastro = new Intent(Login.this, Cadastro.class); startActivity(abreCadastro); } }); btLogar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if (networkInfo != null && networkInfo.isConnected()) { String email = loginEmail.getText().toString(); String senha = loginSenha.getText().toString(); if(email.isEmpty() && senha.matches(".*[a-z].*")) { loginEmail.setError("Insira seu endereço de Email."); } else if (email.matches(".*[a-z].*") && senha.isEmpty()) { loginSenha.setError("Insira sua Senha."); } else if (email.isEmpty() && senha.isEmpty()) { Toast.makeText(getApplicationContext(), "Nenhum campo pode ficar vazio.", Toast.LENGTH_LONG).show(); } else { // Casa url = "http://192.168.1.100/lyne/logar.php"; // Badran // url = "http://172.16.2.15/lyne/logar.php"; parametro = "email=" + email + "&senha=" + senha; new SolicitaDados().execute(url); } } else { Toast.makeText(getApplicationContext(), "Nenhuma conexão com a Internet foi encontrada.", Toast.LENGTH_LONG).show(); } } }); } private class SolicitaDados extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... urls) { return Conexao.postDados(urls[0], parametro); } @Override protected void onPostExecute(String resultado) { if(resultado != null) { if (resultado.contains("login_ok")) { String[] dados = resultado.split(","); Intent abreHome = new Intent(Login.this, Home.class); abreHome.putExtra("idusu", dados[1]); abreHome.putExtra("nomeusu", dados[2]); startActivity(abreHome); } else { Toast.makeText(getApplicationContext(), "Usuário ou senha incorretos.", Toast.LENGTH_LONG).show(); } } } } @Override protected void onPause() { super.onPause(); finish(); } }，因为您使用的是Application.DoEvents()，因此当您在{{1}处设置值时，进度条会自动刷新方法。

而且你也不需要＆＃34;计算＆＃34;百分比，如行：

BackgroundWorker

如果您只是设置进度条bgw_ProgressChanged并在int percents = (i * 100) / ultimaRiga;之后，Windows窗体将自动计算百分比，并在进度条中正确设置进度。

在你的代码中你可以这样做：

Maximum

什么是使用BackgroundWorker更新进度条的正确方法？

1 个答案: