1.將泛型集合類轉(zhuǎn)換成DataTable（表中無(wú)數(shù)據(jù)時(shí)使用）：

十年的譙城網(wǎng)站建設(shè)經(jīng)驗(yàn)，針對(duì)設(shè)計(jì)、前端、開發(fā)、售后、文案、推廣等六對(duì)一服務(wù)，響應(yīng)快，48小時(shí)及時(shí)工作處理。全網(wǎng)營(yíng)銷推廣的優(yōu)勢(shì)是能夠根據(jù)用戶設(shè)備顯示端的尺寸不同，自動(dòng)調(diào)整譙城建站的顯示方式，使網(wǎng)站能夠適用不同顯示終端，在瀏覽器中調(diào)整網(wǎng)站的寬度，無(wú)論在任何一種瀏覽器上瀏覽網(wǎng)站，都能展現(xiàn)優(yōu)雅布局與設(shè)計(jì)，從而大程度地提升瀏覽體驗(yàn)。創(chuàng)新互聯(lián)公司從事“譙城網(wǎng)站設(shè)計(jì)”,“譙城網(wǎng)站推廣”以來(lái)，每個(gè)客戶項(xiàng)目都認(rèn)真落實(shí)執(zhí)行。

public static DataTable NullListToDataTable(IList list)
        {
            var result = new DataTable();
            if (list.Count <= 0) return result;
            var propertys = list[0].GetType().GetProperties();
            foreach (var pi in propertys)
            {
                if (pi != null)
                {
                    result.Columns.Add(pi.Name, pi.PropertyType);
                }
            }
            for (var i = 0; i < list.Count; i++)
            {
                var tempList = new ArrayList();
                foreach (var pi in propertys)
                {
                    var obj = pi.GetValue(list[i], null);
                    tempList.Add(obj);
                }
                var array = tempList.ToArray();
                result.LoadDataRow(array, true);
            }
            return result;
        }

  2.將泛型集合類轉(zhuǎn)換成DataTable（表中有數(shù)據(jù)時(shí)使用）：

public static DataTable NoNullListToDataTable<T>(IList<T> list)
        {
            var ds = new DataSet();
            var dt = new DataTable(typeof(T).Name);
            var myPropertyInfo =
                typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
            foreach (var t in list)
            {
                if (t == null) continue;
                var row = dt.NewRow();
                for (int i = 0, j = myPropertyInfo.Length; i < j; i++)
                {
                    var pi = myPropertyInfo[i];
                    var name = pi.Name;
                    if (dt.Columns[name] != null) continue;
                    DataColumn column;
                    if (pi.PropertyType.UnderlyingSystemType.ToString() == "System.Nullable`1[System.Int32]")
                    {
                        column = new DataColumn(name, typeof(int));
                        dt.Columns.Add(column);
                        if (pi.GetValue(t, null) != null)
                            row[name] = pi.GetValue(t, null);
                        else
                            row[name] = DBNull.Value;
                    }
                    else
                    {
                        column = new DataColumn(name, pi.PropertyType);
                        dt.Columns.Add(column);
                        row[name] = pi.GetValue(t, null);
                    }
                }
                dt.Rows.Add(row);
            }
            ds.Tables.Add(dt);
            return ds.Tables[0];
        }

3.表中有數(shù)據(jù)或無(wú)數(shù)據(jù)時(shí)使用,可排除DATASET不支持System.Nullable錯(cuò)誤：

public static DataTable ToDataTable<T>(IList<T> list)
        {
            if (list == null || list.Count <= 0)
            {
                var result = new DataTable();
                object temp;
                if (list == null || list.Count <= 0) return result;
                var propertys = list[0].GetType().GetProperties();
                foreach (var pi in propertys)
                {
                    {
                        result.Columns.Add(pi.Name, pi.PropertyType);
                    }
                }
                for (var i = 0; i < list.Count; i++)
                {
                    var tempList = new ArrayList();
                    foreach (var pi in propertys)
                    {
                        var obj = pi.GetValue(list[i], null);
                        tempList.Add(obj);
                    }
                    var array = tempList.ToArray();
                    result.LoadDataRow(array, true);
                }
                return result;
            }
            var ds = new DataSet();
            var dt = new DataTable(typeof(T).Name);
            var myPropertyInfo =
                typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
            foreach (var t in list)
            {
                if (t == null) continue;
                var row = dt.NewRow();
                for (int i = 0, j = myPropertyInfo.Length; i < j; i++)
                {
                    var pi = myPropertyInfo[i];
                    var name = pi.Name;
                    if (dt.Columns[name] != null) continue;
                    DataColumn column;
                    if (pi.PropertyType.UnderlyingSystemType.ToString() == "System.Nullable`1[System.Int32]")
                    {
                        column = new DataColumn(name, typeof(int));
                        dt.Columns.Add(column);
                        if (pi.GetValue(t, null) != null)
                            row[name] = pi.GetValue(t, null);
                        else
                            row[name] = DBNull.Value;
                    }
                    else
                    {
                        column = new DataColumn(name, pi.PropertyType);
                        dt.Columns.Add(column);
                        row[name] = pi.GetValue(t, null);
                    }
                }
                dt.Rows.Add(row);
            }
            ds.Tables.Add(dt);
            return ds.Tables[0];
        }

4.合并相同的DataTable：

public static DataTable MergeSameDatatable(DataTable dataTable1, DataTable dataTable2)
        {
            var newDataTable = dataTable1.Clone();
            var obj = new object[newDataTable.Columns.Count];
            for (var i = 0; i < dataTable1.Rows.Count; i++)
            {
                dataTable1.Rows[i].ItemArray.CopyTo(obj, 0);
                newDataTable.Rows.Add(obj);
            }
            for (var i = 0; i < dataTable2.Rows.Count; i++)
            {
                dataTable2.Rows[i].ItemArray.CopyTo(obj, 0);
                newDataTable.Rows.Add(obj);
            }
            return new DataTable();
        }

5.將兩個(gè)列不同的DataTable合并成一個(gè)新的DataTable ：

public static DataTable UniteDataTable(DataTable dt1, DataTable dt2, string dtName)
        {
            var dt3 = dt1.Clone();
            for (var i = 0; i < dt2.Columns.Count; i++)
            {
                dt3.Columns.Add(dt2.Columns[i].ColumnName);
            }
            var obj = new object[dt3.Columns.Count];

            for (int i = 0; i < dt1.Rows.Count; i++)
            {
                dt1.Rows[i].ItemArray.CopyTo(obj, 0);
                dt3.Rows.Add(obj);
            }

            if (dt1.Rows.Count >= dt2.Rows.Count)
            {
                for (var i = 0; i < dt2.Rows.Count; i++)
                {
                    for (var j = 0; j < dt2.Columns.Count; j++)
                    {
                        dt3.Rows[i][j + dt1.Columns.Count] = dt2.Rows[i][j].ToString();
                    }
                }
            }
            else
            {
                for (var i = 0; i < dt2.Rows.Count - dt1.Rows.Count; i++)
                {
                    var dr3 = dt3.NewRow();
                    dt3.Rows.Add(dr3);
                }
                for (var i = 0; i < dt2.Rows.Count; i++)
                {
                    for (var j = 0; j < dt2.Columns.Count; j++)
                    {
                        dt3.Rows[i][j + dt1.Columns.Count] = dt2.Rows[i][j].ToString();
                    }
                }
            }
            dt3.TableName = dtName;
            return dt3;
        }

6.Datatable 轉(zhuǎn) List<Dictionary<string, object>：

public static List<Dictionary<string, object>> DataTableToListDictory(DataTable table)
        {
            var ld = new List<Dictionary<string, object>>();
            for (var i = 0; i < table.Rows.Count; i++)
            {
                var dic = new Dictionary<string, object>();
                for (var j = 0; j < table.Columns.Count; j++)
                {
                    dic.Add(table.Columns[j].ColumnName, table.Rows[i][j]);
                }
                ld.Add(dic);
            }
            return ld;
        }

網(wǎng)站標(biāo)題：DotNet中的DataTable相關(guān)操作
網(wǎng)址分享：http://aaarwkj.com/article24/gjdece.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供網(wǎng)站改版、用戶體驗(yàn)、商城網(wǎng)站、電子商務(wù)、網(wǎng)站收錄、微信公眾號(hào)

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請(qǐng)盡快告知，我們將會(huì)在第一時(shí)間刪除。文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng)，如需處理請(qǐng)聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時(shí)需注明來(lái)源： 創(chuàng)新互聯(lián)