如何从控制器运行此代码？答案

【问题标题】：How to run this code from a Controller?如何从控制器运行此代码？
【发布时间】：2010-10-26 18:19:18
【问题描述】：

我找到了将数据表导出到 excel 的代码，但我不知道如何让控制器返回结果。

有什么建议吗？这是代码

dt = city.GetAllCity();//your datatable 
    string attachment = "attachment; filename=city.xls"; 
    Response.ClearContent(); 
    Response.AddHeader("content-disposition", attachment); 
    Response.ContentType = "application/vnd.ms-excel"; 
    string tab = ""; 
    foreach (DataColumn dc in dt.Columns) 
    { 
        Response.Write(tab + dc.ColumnName); 
        tab = "\t"; 
    } 
    Response.Write("\n"); 
    int i; 
    foreach (DataRow dr in dt.Rows) 
    { 
        tab = ""; 
        for (i = 0; i < dt.Columns.Count; i++) 
        { 
            Response.Write(tab + dr[i].ToString()); 
            tab = "\t"; 
        } 
        Response.Write("\n"); 
    } 
    Response.End();

【问题讨论】：

标签： asp.net-mvc-2

【解决方案1】：

你可以直接返回FileStreamResult:

public ActionResult DownloadCities()
{
    dt = city.GetAllCity();//your datatable 
    string attachment = "attachment; filename=city.xls";

    var writer = new StreamWriter(new MemoryStream());

    string tab = "";
    foreach (DataColumn dc in dt.Columns)
    {
        writer.Write(tab + dc.ColumnName);
        tab = "\t";
    }
    writer.Write("\n");
    int i;
    foreach (DataRow dr in dt.Rows)
    {
        tab = "";
        for (i = 0; i < dt.Columns.Count; i++)
        {
            writer.Write(tab + dr[i]);
            tab = "\t";
        }
        writer.Write("\n");
    }

    return File(writer.BaseStream, "application/vnd.ms-excel", "city.xls");
}

【讨论】：