DataGridView中没有列 [英] DataGridView has no columns

问题描述

这是C＃Windows窗体。

This is c# windows forms.

我有应该显示两列，文件名，和修改日期数据网格图。说我这样做的方式是通过一个任务。我也有仅持有文件和路径名，BindingSource的，和数据网格视图的类。此任务运行所在的班级传递的方法。一旦任务完成，类应该有，我可以再设置到GridView回窗体上的网格视图。

I have a data grid view that is supposed to display two columns, file names, and modified date. The way that I'm doing this is through a task. I also have a class that hold only the file and path name, bindingsource, and data grid view. This task runs a method where the class is passed. Once the task is complete the class should have a grid view that I can then set to a gridview back on the form.

类看起来是这样的：

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;
    }
}

该方法我的任务就是调用这个样子的：

The method my task is calling look like this:

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;
        }
    }

我的任务是这样的：

My task looks like this:

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。必须是非负并小于集合的大小。它发生在方法上这一行：

The error I get is System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. It happens in the method on this line:

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

这是发生，因为根据调试GridView控件没有任何列。此外，当它确实有行和数据。我不知道什么是错的。

This is happening because the gridview doesn't have any columns according to the debug. Also, when it DOES have rows and data. I don't know what is wrong.

推荐答案

我想（我不明白究竟为什么）您尝试访问尚不存在的列。

I guess (I don't understand why exactly) you try to access Columns that do not exist yet.

尝试移动code在 DataGridView.DataBindingComplete 事件的这些行

Try to move these lines of code in DataGridView.DataBindingComplete event

FormFields.GridView.Columns[0].Width = (FormFields.GridView.Width / 10) * 6; 
FormFields.GridView.Columns[1].Width = (FormFields.GridView.Width / 10) * 4;

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