Question

我试图遍历多个站点URL以获取以表格形式返回的数据，我遇到的问题是当我将数据源绑定到gridview时它覆盖了以前的foreach，我怎样才能将所有数据写入一个网格视图？我的代码如下。谢谢！

foreach (SPListItem item in items)
                        {
                            string url = item["SiteUrl"].ToString();

                            using (SPSite siteadd = new SPSite(url))
                            using (SPWeb webadd = siteadd.OpenWeb())
                            {
                                //
                                DataGrid grd = null;
                                grd = new DataGrid();

                                DataTable table = webadd.GetUsageData(Microsoft.SharePoint.Administration.SPUsageReportType.browser, Microsoft.SharePoint.Administration.SPUsagePeriodType.lastMonth);
                                if (table == null)
                                {

                                    //  HttpContext.Current.Response.Write("Table Null");

                                }

                                else
                                {
                                    dataGridView1.DataSource = table;
                                }
                            }
                        }

Answer 1

不应将.DataSource设置为'table'，而应将表中的Rows添加到.DataSource表中。这将导致APPEND。

Answer 2

您创建一个数据行，然后向其添加行，如下面的代码

//This Section should be outside your loop 
DataTable dt = new DataTable();
DataColumn dc = new DataColumn("col1", typeof(String));
dt.Columns.Add(dc);

dc = new DataColumn("col2", typeof(String));
dt.Columns.Add(dc);

dc = new DataColumn("col3", typeof(String));
dt.Columns.Add(dc);

dc = new DataColumn("col4", typeof(String));
dt.Columns.Add(dc);
//End of section

//Inside your loop 
DataRow dr = dt.NewRow();

dr[0] = "coldata1";
dr[1] = "coldata2";
dr[2] = "coldata3";
dr[3] = "coldata4";

dt.Rows.Add(dr);

Answer 3

不是将单个站点数据表绑定到Datagrid，而是应该在循环外创建另一个数据表，该数据表将包含来自所有单个项目的数据，如下所示：

DataTable aggregatedTable = new DataTable();
            foreach (SPListItem item in items)
            {
                string url = item["SiteUrl"].ToString();

                using (SPSite siteadd = new SPSite(url))
                using (SPWeb webadd = siteadd.OpenWeb())
                {
                    //
                    DataGrid grd = null;
                    grd = new DataGrid();

                    DataTable table = webadd.GetUsageData(Microsoft.SharePoint.Administration.SPUsageReportType.browser, Microsoft.SharePoint.Administration.SPUsagePeriodType.lastMonth);
                    if (table == null)
                    {
                        //  HttpContext.Current.Response.Write("Table Null");
                    }
                    else
                    {
                        aggregatedTable.Merge(table);//Append the data to previous site data.
                    }
                }
            }
            dataGridView1.DataSource = aggregatedTable;//bind datatable with aggregated data

如何将foreach迭代到数据表中

3 个答案: