回答編集履歴
3
訂正
test
CHANGED
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@@ -230,7 +230,7 @@
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DataSet ds = CreateDataSource();
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file = "withschema.xml";
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string file = "withschema.xml";
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ds.WriteXml(dir + file, XmlWriteMode.WriteSchema);
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2
追記
test
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@@ -181,3 +181,193 @@
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ID: 14, Name: Product Name_14, Price: 1845000, Discontinued: True, Date: 2018/10/26 11:10:33
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```
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**【追記２】**
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下の私の 2018/10/27 15:22 のコメントで「具体的にどのようにするかは後で回答欄に追記しておきます」と書きましたが、それを以下に書きます。
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コードを読めばわかると思うのでコードだけ。
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```
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Data;
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namespace ConsoleApplication1
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{
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class Program
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{
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static void Main(string[] args)
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{
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string dir = @"どこかの適当なフォルダ";
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DataSet ds = CreateDataSource();
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file = "withschema.xml";
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ds.WriteXml(dir + file, XmlWriteMode.WriteSchema);
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file = "WithoutSchema.xml";
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ds.WriteXml(dir + file, XmlWriteMode.IgnoreSchema);
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DataSet dataset1 = new DataSet();
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DataSet dataset2 = new DataSet();
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dataset1.ReadXml(dir + "WithSchema.xml");
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dataset2.ReadXml(dir + "WithoutSchema.xml");
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Type type1 = dataset1.Tables[0].Columns["Date"].DataType;
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Type type2 = dataset2.Tables[0].Columns["Date"].DataType;
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Console.WriteLine($"Type: {type1}");
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Console.WriteLine($"Type: {type2}");
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// 結果は：
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// Type: System.DateTime
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// Type: System.String
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DataRow[] datarows = (from row in dataset1.Tables[0].AsEnumerable()
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let date = row.Field<DateTime>("Date")
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where date <= DateTime.Now && date >= DateTime.Now.AddDays(-7)
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select row).ToArray();
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foreach (DataRow row in datarows)
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{
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Console.WriteLine($"ID: {row[0]}, Name: {row[1]}, Price: {row[2]}, Discontinued: {row[3]}, Date: {row[4]}");
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}
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// 結果は：
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// ID: 9, Name: Product Name_9, Price: 1230000, Discontinued: False, Date: 2018 / 10 / 21 15:27:08
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// ID: 10, Name: Product Name_10, Price: 1353000, Discontinued: True, Date: 2018 / 10 / 22 15:27:08
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// ID: 11, Name: Product Name_11, Price: 1476000, Discontinued: False, Date: 2018 / 10 / 23 15:27:08
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// ID: 12, Name: Product Name_12, Price: 1599000, Discontinued: True, Date: 2018 / 10 / 24 15:27:08
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// ID: 13, Name: Product Name_13, Price: 1722000, Discontinued: False, Date: 2018 / 10 / 25 15:27:08
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// ID: 14, Name: Product Name_14, Price: 1845000, Discontinued: True, Date: 2018 / 10 / 26 15:27:08
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}
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// データソース用の DataSet を作成
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protected static DataSet CreateDataSource()
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{
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DataTable dt = new DataTable();
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DataRow dr;
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dt.Columns.Add(new DataColumn("ID", typeof(Int32)));
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dt.Columns.Add(new DataColumn("Name", typeof(string)));
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dt.Columns.Add(new DataColumn("Price", typeof(decimal)));
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dt.Columns.Add(new DataColumn("Discontinued", typeof(bool)));
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dt.Columns.Add(new DataColumn("Date", typeof(DateTime)));
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for (int i = 0; i < 15; i++)
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{
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dr = dt.NewRow();
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dr["ID"] = i;
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dr["Name"] = "Product Name_" + i.ToString();
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dr["Price"] = 123000 * (i + 1);
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dr["Discontinued"] = (i % 2 == 0) ? true : false;
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dr["Date"] = DateTime.Now.AddDays(i - 15);
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dt.Rows.Add(dr);
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}
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DataSet ds = new DataSet();
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ds.Tables.Add(dt);
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return ds;
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}
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}
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}
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```
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1
追記
test
CHANGED
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@@ -109,3 +109,75 @@
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kiichi54321 さん、runny_nose さんの回答は DataTable の当該列が DateTime 型であるという前提だと思いますが、そうだとすると DataTable を直さないと話が違ってくると思います。
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**【追記】**
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116
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117
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118
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119
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+
下の私の 2018/10/27 11:23 のコメントで「後で検証して回答欄に追記しておきます」と書きましたが、それを以下に書きます。
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上にアップしたスキーマ付きの xml ファイルを DataSet.ReadXml メソッドで DataSet/ DataTable に読み込めば Date 列は DateTime 型になります。
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それから前回のスレッド [https://teratail.com/questions/153141](https://teratail.com/questions/153141) の応用で DataRow[] 型のオブジェクトを取得できます。
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具体的には、以下のようにすれば、
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```
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DataSet dataset1 = new DataSet();
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dataset1.ReadXml("xml ファイルのパス");
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DataRow[] datarows = (from row in dataset1.Tables[0].AsEnumerable()
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let date = row.Field<DateTime>("Date")
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where date <= DateTime.Now && date >= DateTime.Now.AddDays(-7)
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select row).ToArray();
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foreach (DataRow row in datarows)
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{
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Console.WriteLine($"ID: {row[0]}, Name: {row[1]}, Price: {row[2]}, Discontinued: {row[3]}, Date: {row[4]}");
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}
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```
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結果は以下のようになります：
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166
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167
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168
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```
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170
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ID: 9, Name: Product Name_9, Price: 1230000, Discontinued: False, Date: 2018/10/21 11:10:33
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ID: 10, Name: Product Name_10, Price: 1353000, Discontinued: True, Date: 2018/10/22 11:10:33
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ID: 11, Name: Product Name_11, Price: 1476000, Discontinued: False, Date: 2018/10/23 11:10:33
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ID: 12, Name: Product Name_12, Price: 1599000, Discontinued: True, Date: 2018/10/24 11:10:33
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ID: 13, Name: Product Name_13, Price: 1722000, Discontinued: False, Date: 2018/10/25 11:10:33
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180
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ID: 14, Name: Product Name_14, Price: 1845000, Discontinued: True, Date: 2018/10/26 11:10:33
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182
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```
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