doc add FQA

README.md

@@ -635,6 +635,40 @@ public static IEnumerable<T> Page<T>(IEnumerable<T> en, int pageSize, int page)
 
 
 
+### FQA
+
+#### Q: How to Query as DataTable
+
+Note : There will be no advantage *whatsoever* in using MiniExcel for a scenario involving `DataSet` or `DataTable`.
+
+```C#
+public static DataTable QueryAsDataTable(string path)
+{
+	var rows = MiniExcel.Query(path, true);
+	var dt = new DataTable();
+	var first = true;
+	foreach (IDictionary<string, object> row in rows)
+	{
+		if (first)
+		{
+			foreach (var key in row.Keys)
+			{
+				var type = row[key]?.GetType() ?? typeof(string);
+				dt.Columns.Add(key, type);
+			}
+
+			first = false;
+		}
+		dt.Rows.Add(row.Values.ToArray());
+	}
+	return dt;
+}
+```
+
+![image-20210415120352604](https://i.loli.net/2021/04/15/TbtP1GLDEgONueK.png)
+
+
+
 ### Limitations and caveats 
 
 - Not support xls and encrypted file now

README.zh-CN.md

@@ -642,6 +642,40 @@ public static IEnumerable<T> Page<T>(IEnumerable<T> en, int pageSize, int page)
 
 
 
+### FQA
+
+#### Q: 如何将查询结果转为 DataTable
+
+提醒 : 不建议使用，因为DataTable会将数据`全载入内存`，失去MiniExcel低内存消耗功能。
+
+```C#
+public static DataTable QueryAsDataTable(string path)
+{
+	var rows = MiniExcel.Query(path, true);
+	var dt = new DataTable();
+	var first = true;
+	foreach (IDictionary<string, object> row in rows)
+	{
+		if (first)
+		{
+			foreach (var key in row.Keys)
+			{
+				var type = row[key]?.GetType() ?? typeof(string);
+				dt.Columns.Add(key, type);
+			}
+
+			first = false;
+		}
+		dt.Rows.Add(row.Values.ToArray());
+	}
+	return dt;
+}
+```
+
+![image-20210415120352604](https://i.loli.net/2021/04/15/TbtP1GLDEgONueK.png)
+
+
+
 ### 局限与警告
 
 - 目前不支援 xls (97-2003) 或是加密文件。

README.zh-Hant.md

@@ -643,6 +643,40 @@ public static IEnumerable<T> Page<T>(IEnumerable<T> en, int pageSize, int page)
 
 
 
+### FQA
+
+#### Q: 如何將查詢結果轉為 DataTable
+
+提醒 : 不建議使用，因為DataTable會將數據`全載入記憶體`，失去MiniExcel低記憶體消耗功能。
+
+```C#
+public static DataTable QueryAsDataTable(string path)
+{
+	var rows = MiniExcel.Query(path, true);
+	var dt = new DataTable();
+	var first = true;
+	foreach (IDictionary<string, object> row in rows)
+	{
+		if (first)
+		{
+			foreach (var key in row.Keys)
+			{
+				var type = row[key]?.GetType() ?? typeof(string);
+				dt.Columns.Add(key, type);
+			}
+
+			first = false;
+		}
+		dt.Rows.Add(row.Values.ToArray());
+	}
+	return dt;
+}
+```
+
+![image-20210415120352604](https://i.loli.net/2021/04/15/TbtP1GLDEgONueK.png)
+
+
+
 ### 侷限與警告
 
 - 目前不支援 xls (97-2003) 或是加密檔案。

drafts/【Try】XDocument Remove Namespace.linq

@@ -14,12 +14,27 @@
   <RemoveNamespace>System.Transactions</RemoveNamespace>
 </Query>
 
-void Main()
-{
+void Main(){
 	var doc = XDocument.Parse(xml);
+
 	XmlNamespaceManager ns = new XmlNamespaceManager(new NameTable());
 	ns.AddNamespace("x", "http://schemas.openxmlformats.org/spreadsheetml/2006/main");
 
+	var dimension = doc.XPathSelectElement("/worksheet/dimension", ns);
+}
+
+void Main2()
+{
+	var doc = XDocument.Parse(xml);
+
+
+	XmlNamespaceManager ns = new XmlNamespaceManager(new NameTable());
+	ns.AddNamespace("x", "http://schemas.openxmlformats.org/spreadsheetml/2006/main");
+
+
+
+
+
 	var dimension = doc.XPathSelectElement("/x:worksheet/x:dimension", ns);
 	Console.WriteLine(dimension); //<dimension ref="A1:B100" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" />