Question

我正在使用RESTful Web服务，我有一个列表，列出了我想要添加到gridview的所有对象。当我将它们添加到DataTable中的每一行时，每行的结果都是相同的。我不确定我做错了什么？

protected void ButtonSearch_Click(object sender, EventArgs e)
    {
        Results trackResults = (Results)Session["Result"];
        foreach (Tracks t in trackResults.results)
        {

            //create datatable and columns,
             DataTable table = new DataTable();

            table.Columns.Add("Artist Name");
            table.Columns.Add("Collection Name");
            table.Columns.Add("Track Name");
            table.Columns.Add("Artwork");
            table.Columns.Add("Track Price");
            table.Columns.Add("Release Date");
            table.Columns.Add("Genre");



            for (int i = 0; i < trackResults.results.Count; i++)
            {
                DataRow dr1 = table.NewRow();
                dr1["Artist Name"] = t.artistName;
                dr1["Collection Name"] = t.collectionName;
                dr1["Track Name"] = t.trackName;
                dr1["Artwork"] = t.artworkUrl30;
                dr1["Track Price"] = t.trackPrice;
                dr1["Release Date"] = t.releaseDate;
                dr1["Genre"] = t.primaryGenreName;
                table.Rows.Add(dr1);

            }
            GridView1.DataSource = table;
            GridView1.DataBind();

Answer 1

1-无需在foreach循环中创建数据表，也无需编写for循环。

2-您应该在循环外部创建数据表和列，然后创建行并向表中添加行

3-将表分配给foreach循环结束的datagridview。

我已经编辑了下面的代码，但没有编译。试试吧

protected void ButtonSearch_Click(object sender, EventArgs e)
{
    Results trackResults = (Results)Session["Result"];

    //create datatable and columns,
         DataTable table = new DataTable();

        table.Columns.Add("Artist Name");
        table.Columns.Add("Collection Name");
        table.Columns.Add("Track Name");
        table.Columns.Add("Artwork");
        table.Columns.Add("Track Price");
        table.Columns.Add("Release Date");
        table.Columns.Add("Genre");

    foreach (Tracks t in trackResults.results)
    {

            DataRow dr1 = table.NewRow();
            dr1["Artist Name"] = t.artistName;
            dr1["Collection Name"] = t.collectionName;
            dr1["Track Name"] = t.trackName;
            dr1["Artwork"] = t.artworkUrl30;
            dr1["Track Price"] = t.trackPrice;
            dr1["Release Date"] = t.releaseDate;
            dr1["Genre"] = t.primaryGenreName;
            table.Rows.Add(dr1);

        }
        GridView1.DataSource = table;
        GridView1.DataBind();
}

Answer 2

看起来您需要更改初始化内容的方式。现在，您正在为trackResults.results中的每个记录创建新的表对象，然后在每次迭代时在绑定网格上创建。您可能希望将其更改为：

protected void ButtonSearch_Click(object sender, EventArgs e)
{
    Results trackResults = (Results)Session["Result"];

    //create datatable and columns,
    DataTable table = new DataTable();
    table.Columns.Add("Artist Name");
    table.Columns.Add("Collection Name");
    table.Columns.Add("Track Name");
    table.Columns.Add("Artwork");
    table.Columns.Add("Track Price");
    table.Columns.Add("Release Date");
    table.Columns.Add("Genre");

    foreach (Tracks t in trackResults.results)
    {
        DataRow dr1 = table.NewRow();
        dr1["Artist Name"] = t.artistName;
        dr1["Collection Name"] = t.collectionName;
        dr1["Track Name"] = t.trackName;
        dr1["Artwork"] = t.artworkUrl30;
        dr1["Track Price"] = t.trackPrice;
        dr1["Release Date"] = t.releaseDate;
        dr1["Genre"] = t.primaryGenreName;
        table.Rows.Add(dr1);
    }

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

为每行添加相同的gridview值

2 个答案: