C# DataGridView没有列

这是c#windows窗体

我有一个数据网格视图，它应该显示两列、文件名和修改日期。我这样做的方式是通过一项任务。我还有一个只包含文件名和路径名、bindingsource和数据网格视图的类。此任务运行传递类的方法。任务完成后，类应该有一个网格视图，然后我可以将其设置回表单上的网格视图

该类如下所示：

class GetLogFilesParameters
{
    public string FileNameandPath;
    public BindingSource BindingSource;
    public DataGridView GridView;

    public GetLogFilesParameters(string _fileNameAndPath)
    {
        FileNameandPath = _fileNameAndPath;
        BindingSource = new BindingSource();
        GridView = new DataGridView();
        GridView.DataSource = BindingSource;
    }
}

private static void GetLogFilesTest(GetLogFilesParameters FormFields)
    {
        Cursor.Current = Cursors.WaitCursor;

        try
        {
            //Setup data table
            DataTable FileList = new DataTable();
            FileList.Clear();
            DataColumn FileNameColumn = new DataColumn();
            FileNameColumn.ColumnName = "FileName";
            FileNameColumn.DataType = System.Type.GetType("System.String");

            DataColumn DateColumn = new DataColumn();
            DateColumn.ColumnName = "ModifiedDate";
            DateColumn.DataType = System.Type.GetType("System.DateTime");

            FileList.Columns.Add(FileNameColumn);
            FileList.Columns.Add(DateColumn);

            //Get a list of files in a directory
            string[] files = Directory.GetFiles(FormFields.FileNameandPath, "*.log");

            //Loop through the files and fill the data table with a row for each
            foreach (string file in files)
            {
                FileInfo FileInformation = new FileInfo(file);
                DataRow row = FileList.NewRow();
                row["FileName"] = FileInformation.Name;
                row["ModifiedDate"] = FileInformation.LastWriteTime;
                FileList.Rows.Add(row);
            }

            //FormFields.GridView.Columns.Add("FileName", "File Name");
            //FormFields.GridView.Columns.Add("ModifiedDate", "Modified Date");
            FormFields.GridView.AutoGenerateColumns = true;

            //Setup the binding source
            FormFields.BindingSource.DataSource = FileList;
            FormFields.BindingSource.Sort = "ModifiedDate DESC";

            FormFields.GridView.Columns[0].Width = (FormFields.GridView.Width / 10) * 6;
            FormFields.GridView.Columns[1].Width = (FormFields.GridView.Width / 10) * 4;
        }
        catch (Exception ex)
        {
            string ErrorText = "Error trying to get the list of log files." + Environment.NewLine + Environment.NewLine;
            ExceptionLogger.LogIt(ErrorText, "Exception");
            MessageBox.Show(ErrorText + ex.ToString());
        }
        finally
        {
            Cursor.Current = Cursors.Default;
        }
    }

GetLogFilesParameters GetLogFilesParameters = new GetLogFilesParameters(EpicorSenderPath);
            Task tGetFiles1 = new Task(() => GetLogFilesTest(GetLogFilesParameters));
            tGetFiles1.Start();
            tGetFiles1.ContinueWith((antecedent) =>
                {
                    gvEpicorSenderFiles = GetLogFilesParameters.GridView;
                }, TaskScheduler.FromCurrentSynchronizationContext());

我的任务正在调用的方法如下所示：

class GetLogFilesParameters
{
    public string FileNameandPath;
    public BindingSource BindingSource;
    public DataGridView GridView;

    public GetLogFilesParameters(string _fileNameAndPath)
    {
        FileNameandPath = _fileNameAndPath;
        BindingSource = new BindingSource();
        GridView = new DataGridView();
        GridView.DataSource = BindingSource;
    }
}

private static void GetLogFilesTest(GetLogFilesParameters FormFields)
    {
        Cursor.Current = Cursors.WaitCursor;

        try
        {
            //Setup data table
            DataTable FileList = new DataTable();
            FileList.Clear();
            DataColumn FileNameColumn = new DataColumn();
            FileNameColumn.ColumnName = "FileName";
            FileNameColumn.DataType = System.Type.GetType("System.String");

            DataColumn DateColumn = new DataColumn();
            DateColumn.ColumnName = "ModifiedDate";
            DateColumn.DataType = System.Type.GetType("System.DateTime");

            FileList.Columns.Add(FileNameColumn);
            FileList.Columns.Add(DateColumn);

            //Get a list of files in a directory
            string[] files = Directory.GetFiles(FormFields.FileNameandPath, "*.log");

            //Loop through the files and fill the data table with a row for each
            foreach (string file in files)
            {
                FileInfo FileInformation = new FileInfo(file);
                DataRow row = FileList.NewRow();
                row["FileName"] = FileInformation.Name;
                row["ModifiedDate"] = FileInformation.LastWriteTime;
                FileList.Rows.Add(row);
            }

            //FormFields.GridView.Columns.Add("FileName", "File Name");
            //FormFields.GridView.Columns.Add("ModifiedDate", "Modified Date");
            FormFields.GridView.AutoGenerateColumns = true;

            //Setup the binding source
            FormFields.BindingSource.DataSource = FileList;
            FormFields.BindingSource.Sort = "ModifiedDate DESC";

            FormFields.GridView.Columns[0].Width = (FormFields.GridView.Width / 10) * 6;
            FormFields.GridView.Columns[1].Width = (FormFields.GridView.Width / 10) * 4;
        }
        catch (Exception ex)
        {
            string ErrorText = "Error trying to get the list of log files." + Environment.NewLine + Environment.NewLine;
            ExceptionLogger.LogIt(ErrorText, "Exception");
            MessageBox.Show(ErrorText + ex.ToString());
        }
        finally
        {
            Cursor.Current = Cursors.Default;
        }
    }

GetLogFilesParameters GetLogFilesParameters = new GetLogFilesParameters(EpicorSenderPath);
            Task tGetFiles1 = new Task(() => GetLogFilesTest(GetLogFilesParameters));
            tGetFiles1.Start();
            tGetFiles1.ContinueWith((antecedent) =>
                {
                    gvEpicorSenderFiles = GetLogFilesParameters.GridView;
                }, TaskScheduler.FromCurrentSynchronizationContext());

我的任务如下所示：

class GetLogFilesParameters
{
    public string FileNameandPath;
    public BindingSource BindingSource;
    public DataGridView GridView;

    public GetLogFilesParameters(string _fileNameAndPath)
    {
        FileNameandPath = _fileNameAndPath;
        BindingSource = new BindingSource();
        GridView = new DataGridView();
        GridView.DataSource = BindingSource;
    }
}

private static void GetLogFilesTest(GetLogFilesParameters FormFields)
    {
        Cursor.Current = Cursors.WaitCursor;

        try
        {
            //Setup data table
            DataTable FileList = new DataTable();
            FileList.Clear();
            DataColumn FileNameColumn = new DataColumn();
            FileNameColumn.ColumnName = "FileName";
            FileNameColumn.DataType = System.Type.GetType("System.String");

            DataColumn DateColumn = new DataColumn();
            DateColumn.ColumnName = "ModifiedDate";
            DateColumn.DataType = System.Type.GetType("System.DateTime");

            FileList.Columns.Add(FileNameColumn);
            FileList.Columns.Add(DateColumn);

            //Get a list of files in a directory
            string[] files = Directory.GetFiles(FormFields.FileNameandPath, "*.log");

            //Loop through the files and fill the data table with a row for each
            foreach (string file in files)
            {
                FileInfo FileInformation = new FileInfo(file);
                DataRow row = FileList.NewRow();
                row["FileName"] = FileInformation.Name;
                row["ModifiedDate"] = FileInformation.LastWriteTime;
                FileList.Rows.Add(row);
            }

            //FormFields.GridView.Columns.Add("FileName", "File Name");
            //FormFields.GridView.Columns.Add("ModifiedDate", "Modified Date");
            FormFields.GridView.AutoGenerateColumns = true;

            //Setup the binding source
            FormFields.BindingSource.DataSource = FileList;
            FormFields.BindingSource.Sort = "ModifiedDate DESC";

            FormFields.GridView.Columns[0].Width = (FormFields.GridView.Width / 10) * 6;
            FormFields.GridView.Columns[1].Width = (FormFields.GridView.Width / 10) * 4;
        }
        catch (Exception ex)
        {
            string ErrorText = "Error trying to get the list of log files." + Environment.NewLine + Environment.NewLine;
            ExceptionLogger.LogIt(ErrorText, "Exception");
            MessageBox.Show(ErrorText + ex.ToString());
        }
        finally
        {
            Cursor.Current = Cursors.Default;
        }
    }

GetLogFilesParameters GetLogFilesParameters = new GetLogFilesParameters(EpicorSenderPath);
            Task tGetFiles1 = new Task(() => GetLogFilesTest(GetLogFilesParameters));
            tGetFiles1.Start();
            tGetFiles1.ContinueWith((antecedent) =>
                {
                    gvEpicorSenderFiles = GetLogFilesParameters.GridView;
                }, TaskScheduler.FromCurrentSynchronizationContext());

我得到的错误是System.ArgumentOutOfRangeException:索引超出范围。必须为非负数且小于集合的大小。它发生在这一行的方法中：

FormFields.GridView.Columns[0].Width = (FormFields.GridView.Width / 10) * 6;

发生这种情况是因为根据调试，gridview没有任何列。而且，当它确实有行和数据时。我不知道出了什么问题。

我想（我不明白确切的原因）您试图访问尚不存在的列

尝试在事件中移动这些代码行

---

我不清楚。你在使用异步方法吗？很抱歉我对你的问题一无所知。我第一次使用任务，并打算通过传递以前实例化的类来调用方法。那部分似乎起作用了。我想包括这一点，因为我想让每个人都完全理解发生了什么。无知可能来自我这边。。。能否尝试在DataGridView.DataBindingComplete事件中移动这些代码行？FormFields.GridView.Columns[0]。宽度=（FormFields.GridView.Width/10）*6；FormFields.GridView.Columns[1]。宽度=（FormFields.GridView.Width/10）*4；[1] ：那奏效了。有趣的是，在分配数据源之后，datagridview的设置似乎不足以让您能够操作应该自动生成的列。然而，我也相信在那个地方有这种类型的代码是更好的组织。你能把它作为一个答案，这样我就可以投票了吗？我假设在我分配数据源之后它们会存在。我还没有完全理解datagridviews。你的建议很有效。非常感谢。在我投票支持这件事之前，我需要多一点声誉。