diff --git a/LinqStudy.Test/LinqStudy.Test.csproj b/LinqStudy.Test/LinqStudy.Test.csproj
index f70d100..86d69ce 100644
--- a/LinqStudy.Test/LinqStudy.Test.csproj
+++ b/LinqStudy.Test/LinqStudy.Test.csproj
@@ -20,10 +20,6 @@
<ItemGroup>
<Folder Include="ExpressionTree\" />
- <Folder Include="LinqToDataSet\" />
- <Folder Include="LinqToSQL\" />
- <Folder Include="LinqToXml\" />
- <Folder Include="Util\" />
</ItemGroup>
<ItemGroup>
diff --git a/LinqStudy.Test/LinqToObject/TypeConvertTest.cs b/LinqStudy.Test/LinqToObject/TypeConvertTest.cs
index f875780..349e366 100644
--- a/LinqStudy.Test/LinqToObject/TypeConvertTest.cs
+++ b/LinqStudy.Test/LinqToObject/TypeConvertTest.cs
@@ -18,6 +18,7 @@ namespace LinqStudy.Test.LinqToObject
/// </summary>
public class TypeConvertTest
{
+ #region AsEnumeralbe
/// <summary>
/// AsEnumeralbe操作符:将IEnumerable<T>输入序列转换成IEnumerable<T>的输出序列
/// 主要用于将一个实现了IEnumerable<T>接口的对象转换成一个标准的IEnumerable<T>接口对象。
@@ -33,16 +34,20 @@ namespace LinqStudy.Test.LinqToObject
Assert.NotNull(students);
}
+ #endregion
+ #region AsQueryable
/// <summary>
/// 主要应用与Linq to sql
/// </summary>
[Fact]
public void AsQueryable_Test()
{
- //
+ //
}
+ #endregion
+ #region OfType
/// <summary>
/// OfType：从序列中筛选指定类型的元素，并构建一个序列。
/// </summary>
@@ -50,14 +55,16 @@ namespace LinqStudy.Test.LinqToObject
public void OfType_Test()
{
//动态数组做为数据源
- ArrayList ints = new ArrayList() { 1,"2",3,"4",5};
+ ArrayList ints = new ArrayList() { 1, "2", 3, "4", 5 };
var values = from i in ints.OfType<int>()
- select i;
+ select i;
- Assert.Equal(new List<int>() { 1,3,5}, values.ToList());
+ Assert.Equal(new List<int>() { 1, 3, 5 }, values.ToList());
}
+ #endregion
+ #region Cast
/// <summary>
/// Cast：将数据源中元素，强制转换成指定的类型。
/// 数据源null或存在不能转换的元素，则异常。
@@ -70,7 +77,7 @@ namespace LinqStudy.Test.LinqToObject
var values = ints.Cast<string>();
- Assert.Equal(new List<string>() {"1","2","3","4","5"}, values.ToList());
+ Assert.Equal(new List<string>() { "1", "2", "3", "4", "5" }, values.ToList());
}
[Fact]
@@ -79,7 +86,7 @@ namespace LinqStudy.Test.LinqToObject
//动态数组做为数据源
ArrayList ints = null;
- Assert.Throws<ArgumentNullException>(()=> {
+ Assert.Throws<ArgumentNullException>(() => {
ints.Cast<string>();
});
}
@@ -88,13 +95,15 @@ namespace LinqStudy.Test.LinqToObject
public void Cast_InvalidCastException_Test()
{
//动态数组做为数据源
- ArrayList ints = new ArrayList() { 1,"2",3,"4"};
+ ArrayList ints = new ArrayList() { 1, "2", 3, "4" };
Assert.Throws<InvalidCastException>(() => {
ints.Cast<string>().ToList();
});
}
+ #endregion
+ #region ToList
/// <summary>
/// ToList：将IEnumerable<T>转换为List<T>, 立即执行。
/// 特别注意：此操作破坏"延迟执行"，变为立即执行；
@@ -103,7 +112,7 @@ namespace LinqStudy.Test.LinqToObject
[Fact]
public void ToList_Test()
{
- List<string> email = new List<string>() { "abc@163.com","bcd@126.com","111@163.com"};
+ List<string> email = new List<string>() { "abc@163.com", "bcd@126.com", "111@163.com" };
var query = email.Where(q => q.Contains("@163.")).ToList();
@@ -145,43 +154,222 @@ namespace LinqStudy.Test.LinqToObject
//元素对象不是同一个元素
Assert.NotSame(persons, person2);
}
+ #endregion
+ #region ToDictionary
+ /// <summary>
+ /// ToDictionar转换字典，立即执行并保存快照。
+ /// </summary>
+ [Fact]
+ public void ToDictionary_keySelector_Test()
+ {
+ List<Person> persons = new List<Person>()
+ {
+ new Person() {Id=1, Name="gaofeng",Age = 32 },
+ new Person() {Id=2, Name="zhangsan",Age = 25 },
+ };
+ var dic = persons.ToDictionary(p => p.Id);
- private DataTable GetDataTable()
+ Assert.Equal(1, dic[1].Id);
+ Assert.Equal(2, dic[2].Id);
+ }
+
+ [Fact]
+ public void ToDictionary_keySelector_comparer_Test()
+ {
+ List<Person> persons = new List<Person>()
+ {
+ new Person() {Id=1, Name="gaofeng",Age = 32 },
+ new Person() {Id=2, Name="zhangsan",Age = 25 },
+ };
+
+ IEqualityComparer<Person> equal = new PersonEqual();
+
+ var dic = persons.ToDictionary<Person, int>(p => p.Id, EqualityComparer<int>.Default);
+
+ Assert.Equal("gaofeng", dic[1].Name);
+ Assert.Equal("zhangsan", dic[2].Name);
+ }
+
+ [Fact]
+ public void ToDictionary_keySelector_elementSelector_Test()
+ {
+ List<Person> persons = new List<Person>()
+ {
+ new Person() {Id=1, Name="gaofeng",Age = 32 },
+ new Person() {Id=2, Name="zhangsan",Age = 25 },
+ };
+
+ var dic = persons.ToDictionary(p => p.Id, s => s.Name);
+
+ Assert.Equal("gaofeng", dic[1]);
+ Assert.Equal("zhangsan", dic[2]);
+ }
+
+ [Fact]
+ public void ToDictionary_keySelector_elementSelector_comparer_Test()
+ {
+ List<Person> persons = new List<Person>()
+ {
+ new Person() {Id=1, Name="gaofeng",Age = 32 },
+ new Person() {Id=2, Name="zhangsan",Age = 25 },
+ };
+
+ var dic = persons.ToDictionary(p => p.Id, s => s.Name, EqualityComparer<int>.Default);
+
+ Assert.Equal("gaofeng", dic[1]);
+ Assert.Equal("zhangsan", dic[2]);
+ }
+
+ [Fact]
+ public void ToDictionary_ArgumentException_Test()
+ {
+ List<Person> persons = new List<Person>()
+ {
+ new Person() {Id=1, Name="gaofeng",Age = 32 },
+ new Person() {Id=1, Name="zhangsan",Age = 25 },
+ };
+
+ Assert.Throws<ArgumentException>(() => {
+ persons.ToDictionary(p => p.Id, s => s.Name);
+ });
+ }
+
+ [Fact]
+ public void ToDictionary_ArgumentNullException_Test()
+ {
+ List<Person> persons = new List<Person>()
+ {
+ new Person() {Id=1, Name=null,Age = 32 },
+ new Person() {Id=1, Name="zhangsan",Age = 25 },
+ };
+
+ Assert.Throws<ArgumentNullException>(() => {
+ persons.ToDictionary(p => p.Name, s => s.Name);
+ });
+ }
+
+ [Fact]
+ public void ToDictionary_DataSource_NullException_Test()
+ {
+ List<Person> persons = null;
+
+ Assert.Throws<ArgumentNullException>(() => {
+ persons.ToDictionary(p => p.Name, s => s.Name);
+ });
+ }
+ #endregion
+
+ #region ToLookup
+
+ /// <summary>
+ /// ToLookup：根据指定的键选择器函数从IEnumerable<T>创建Lookup<T>
+ /// Lookup<T>对象表示一个一对多的字典，定义了一个由键和序列组成的元组，类似GroupJoin返回的结果。
+ /// </summary>
+ [Fact]
+ public void ToLookup_Test()
+ {
+ var persons = new List<Employee>()
+ {
+ new Employee(){ Id=1, Name="gaofeng",Emails=new List<string>(){"a1@163.com","a2@163.com","a3@163.com"} },
+ new Employee(){ Id=1, Name="zhangsan",Emails=new List<string>(){ "b1@163.com", "b2@163.com", "b3@163.com" } },
+
+ new Employee(){ Id=2, Name="gaofeng2",Emails=new List<string>(){"c1@163.com","c2@163.com","c3@163.com"} },
+ new Employee(){ Id=2, Name="zhangsan2",Emails=new List<string>(){ "d1@163.com", "d2@163.com", "d3@163.com" } },
+ };
+
+ var lookup = persons.ToLookup(q => q.Id);
+ var group2 = lookup[2];
+ var group2_count = group2.Count();
+
+ Assert.Equal(2,group2_count);
+ }
+
+ [Fact]
+ public void ToLookup_keySelector_comparer_Test()
{
+ var persons = new List<Employee>()
+ {
+ new Employee(){ Id=1, Name="gaofeng",Emails=new List<string>(){"a1@163.com","a2@163.com","a3@163.com"} },
+ new Employee(){ Id=1, Name="zhangsan",Emails=new List<string>(){ "b1@163.com", "b2@163.com", "b3@163.com" } }
+ };
- DataTable dt=new DataTable();
- DataColumn col_id=new DataColumn("Id");
- col_id.AllowDBNull=false;
- col_id.AutoIncrementSeed=1;
- col_id.AutoIncrement=true;
- col_id.AutoIncrementStep=1;
- col_id.DataType=typeof(int);
+ var lookup = persons.ToLookup(q => q.Id,EqualityComparer<int>.Default);
+ var group1_firstEmail = lookup[1].FirstOrDefault().Emails.FirstOrDefault() ;
- DataColumn col_name=new DataColumn("Name");
- col_name.AllowDBNull=true;
- col_name.AutoIncrement=false;
- col_name.DataType=typeof(string);
- col_name.DefaultValue=string.Empty;
+ Assert.Equal("a1@163.com", group1_firstEmail);
+ }
+
+ [Fact]
+ public void ToLookup_keySelector_elementSelector_Test()
+ {
+ var persons = new List<Employee>()
+ {
+ new Employee(){ Id=1, Name="gaofeng",Emails=new List<string>(){"a1@163.com","a2@163.com","a3@163.com"} },
+ new Employee(){ Id=1, Name="zhangsan",Emails=new List<string>(){ "b1@163.com", "b2@163.com", "b3@163.com" } }
+ };
+
+ var lookup = persons.ToLookup(q => q.Id, e=>e.Emails);
+ var group1_Emails = lookup[1].FirstOrDefault();
+ var group1_Emails_first = group1_Emails.FirstOrDefault();
+
+ Assert.Equal("a1@163.com", group1_Emails_first);
+ }
+
+ [Fact]
+ public void ToLookup_keySelector_elementSelector_comparer_Test()
+ {
+ var persons = new List<Employee>()
+ {
+ new Employee(){ Id=1, Name="gaofeng",Emails=new List<string>(){"a1@163.com","a2@163.com","a3@163.com"} },
+ new Employee(){ Id=1, Name="zhangsan",Emails=new List<string>(){ "b1@163.com", "b2@163.com", "b3@163.com" } }
+ };
+
+ var lookup = persons.ToLookup(q => q.Name, e => e.Emails,EqualityComparer<string>.Default);
+ var group1_Emails = lookup["gaofeng"].FirstOrDefault();
+ var group1_Emails_first = group1_Emails.FirstOrDefault();
- DataColumn col_age=new DataColumn("Age");
- col_age.AllowDBNull=false;
- col_age.AutoIncrement=false;
- col_age.DataType=typeof(int);
- col_age.DefaultValue=20;
+ Assert.Equal("a1@163.com", group1_Emails_first);
+ }
+ #endregion
+
+ #region private
+
+ private DataTable GetDataTable()
+ {
+
+ DataTable dt = new DataTable();
+ DataColumn col_id = new DataColumn("Id");
+ col_id.AllowDBNull = false;
+ col_id.AutoIncrementSeed = 1;
+ col_id.AutoIncrement = true;
+ col_id.AutoIncrementStep = 1;
+ col_id.DataType = typeof(int);
+
+ DataColumn col_name = new DataColumn("Name");
+ col_name.AllowDBNull = true;
+ col_name.AutoIncrement = false;
+ col_name.DataType = typeof(string);
+ col_name.DefaultValue = string.Empty;
+
+ DataColumn col_age = new DataColumn("Age");
+ col_age.AllowDBNull = false;
+ col_age.AutoIncrement = false;
+ col_age.DataType = typeof(int);
+ col_age.DefaultValue = 20;
dt.Columns.Add(col_id);
dt.Columns.Add(col_name);
dt.Columns.Add(col_age);
var row_one = dt.NewRow();
- row_one[1]="王高峰";
- row_one[2]=21;
+ row_one[1] = "王高峰";
+ row_one[2] = 21;
var row_2 = dt.NewRow();
- row_2[1]="王向前";
- row_2[2]=32;
+ row_2[1] = "王向前";
+ row_2[2] = 32;
dt.Rows.Add(row_one);
dt.Rows.Add(row_2);
@@ -209,6 +397,6 @@ namespace LinqStudy.Test.LinqToObject
return arrStudent;
}
-
+ #endregion
}
}