将表单文本文件导入gridview c＃

Question

我正在尝试使用自动代码将数据从文本文件导入网格视图：

DataTable dt = new DataTable();
using (System.IO.TextReader tr = File.OpenText((@"d:\\My File3.log")))
{
    string line;
    while ((line = tr.ReadLine()) != null)
    {

        string[] items = line.Trim().Split(' ');
        if (dt.Columns.Count == 0)
        {
            // Create the data columns for the data table based on the number of items
            // on the first line of the file
            for (int i = 0; i < items.Length; i++)
                dt.Columns.Add(new DataColumn("Column" + i, typeof(string)));
        }
        dt.Rows.Add(items);

    }
    //show it in gridview 
    this.GridView1.DataSource = dt;
    this.GridView1.DataBind();

我的文件就像：

A B C

E F D C C

E D D D

D P

然后我收到以下错误

  

输入数组比c＃application

中此表中的列数长

Answer 1

您似乎已根据第一行创建//Item is a class representing any item with id, name and description. public void addItem(Item item) { SQLiteDatabase db = getWritableDatabase(); ContentValues contentValues = new ContentValues(); contentValues.put("name",item.name); // name - column contentValues.put("description",item.description); // description is column in items table, item.description has value for description db.insert("Items", null, contentValues);//Items is table name db.close(); } columns，但第二行有更多列，然后第一行 >。请根据table列检查以下代码。

CODE：

MAX

在您的数据中，某些行有DataTable dt = new DataTable(); List<string[]> list = new List<string[]>(); int maxItem = 0; using (System.IO.TextReader tr = File.OpenText((@"d:\\My File3.log"))) { string line; while ((line = tr.ReadLine()) != null) { string[] items = line.Trim().Split(' '); if (maxItem <= items.Count()) { maxItem = items.Count(); } list.Add(items); } for (int i = 0; i < maxItem; i++) dt.Columns.Add(new DataColumn("Column" + i, typeof(string))); foreach (var items in list) { dt.Rows.Add(items); } //show it in gridview this.GridView1.DataSource = dt; this.GridView1.DataBind(); } 。因此，您必须在代码中检查empty行。

输出您的数据：

Answer 2

您应该在所需的列数（Split(' ')之后）更大而非实际（dt.Columns.Count）之后添加新列：

  // File.ReadLines is easier to read and maintain
  var items = File
   .ReadLines(@"d:\My File3.log") // single \ since we have verbatim string @ 
 //.Where(line => !string.IsNullOrWhiteSpace(line)) // if you want to remove empty lines 
   .Select(line => line.Trim().Split(' '));

  DataTable dt = new DataTable();

  foreach (var line in items) {
    // Do we want extra columns?
    while (line.Length > dt.Columns.Count)
      dt.Columns.Add(new DataColumn($"Column {dt.Columns.Count}", typeof(string)));

    dt.Rows.Add(line);
  }

  GridView1.DataSource = dt;
  GridView1.DataBind();