Newbe.ObjectVisitor 样例 1

我们增加了一些可以使用该库实现功能的场景和做法说明。

将数据库链接字符串转型为数据模型，或者将数据模型格式化为链接字符串。

using System.Collections.Generic;

using System.ComponentModel;

using System.Linq;

using System.Text;

using FluentAssertions;

using NUnit.Framework;

namespace Newbe.ObjectVisitor.Tests

{

public class DataConnectionModelTest

{

public const string ConnectionStringValue =

"Host=www.newbe.pro;Port=36524;Username=newbe36524;Password=newbe.pro;";

[Test]

public void JoinToString()

{

var model = new DataConnectionModel

{

Host = "www.newbe.pro",

Port = 36524,

Username = "newbe36524",

Password = "newbe.pro",

};

var connectionString = model.ToString();

connectionString.Should().Be(ConnectionStringValue);

}

[Test]

public void BuildFromString()

{

var model = DataConnectionModel.FromString(ConnectionStringValue);

var expected = new DataConnectionModel

{

Host = "www.newbe.pro",

Port = 36524,

Username = "newbe36524",

Password = "newbe.pro",

};

model.Should().BeEquivalentTo(expected);

}

public class DataConnectionModel

{

public string Host { get; set; } = null!;

public ushort? Port { get; set; } = null!;

public string Username { get; set; } = null!;

public string Password { get; set; } = null!;

public int? MaxPoolSize { get; set; } = null!;

private static readonly ICachedObjectVisitor<DataConnectionModel, StringBuilder> ConnectionStringBuilder =

default(DataConnectionModel)!

.V()

.WithExtendObject<DataConnectionModel, StringBuilder>()

.ForEach((name, value, sb) => AppendValueIfNotNull(name, value, sb))

.Cache();

private static void AppendValueIfNotNull(string name, object? value, StringBuilder sb)

{

if (value != null)

{

sb.Append($"{name}={value};");

}

public override string ToString()

{

var sb = new StringBuilder();

ConnectionStringBuilder.Run(this, sb);

return sb.ToString();

}

private static readonly ICachedObjectVisitor<DataConnectionModel, Dictionary<string, string>>

ConnectionStringConstructor

default(DataConnectionModel)!

.V()

.WithExtendObject<DataConnectionModel, Dictionary<string, string>>()

.ForEach(context => SetValueIfFound(context))

.Cache();

private static void SetValueIfFound(

IObjectVisitorContext<DataConnectionModel, Dictionary<string, string>, object> c)

{

if (c.ExtendObject.TryGetValue(c.Name, out var stringValue))

{

TypeConverter conv = TypeDescriptor.GetConverter(c.PropertyInfo.PropertyType);

c.Value = conv.ConvertFrom(stringValue)!;

}

public static DataConnectionModel FromString(string connectionString)

{

var dic = connectionString.Split(';')

.Where(x => !string.IsNullOrEmpty(x))

.Select(x => x.Split('='))

.ToDictionary(x => x[0], x => x[1]);

var re = new DataConnectionModel();

ConnectionStringConstructor.Run(re, dic);

return re;

}

将对象中满足手机号码格式的字段替换为密文，避免敏感信息输出。

using System.Text.RegularExpressions;

using FluentAssertions;

using NUnit.Framework;

namespace Newbe.ObjectVisitor.Tests

{

public class ChangePasswordTest

{

[Test]

public void CoverSensitiveDataTest()

{

// here is a model

var userModel = new UserModel

{

Username = "newbe36524",

Password = "newbe.pro",

Phone = "12345678901"

};

// create a data visitor to cover sensitive data

var visitor = userModel.V()

.ForEach<UserModel, string>(x => CoverSensitiveData(x))

.Cache();

visitor.Run(userModel);

var expected = new UserModel

{

Username = "newbe36524",

Password = "***",

Phone = "123****8901",

};

userModel.Should().BeEquivalentTo(expected);

}

private void CoverSensitiveData(IObjectVisitorContext<UserModel, string> c)

{

var value = c.Value;

if (!string.IsNullOrEmpty(value))

{

c.Value = Regex.Replace(value, "(\\d{3})\\d{4}(\\d{4})", "$1****$2");

}

if (c.Name == nameof(UserModel.Password))

{

c.Value = "***";

}

public class UserModel

{

public string Username { get; set; } = null!;

public string Phone { get; set; } = null!;

public string Password { get; set; } = null!;

}

将实现了 `IEnumerable<int>` 的所有属性求和。

using System.Collections.Generic;

using System.Linq;

using FluentAssertions;

using NUnit.Framework;

namespace Newbe.ObjectVisitor.Tests

{

public class EnumerableTest

{

[Test]

public void NameAndValue()

{

var model = new TestModel

{

List1 = new[] {1},

List2 = new[] {2},

List3 = new List<int> {3},

List4 = new HashSet<int> {4}

};

var sumBag = new SumBag();

var visitor = model.V()

.WithExtendObject(sumBag)

.ForEach<TestModel, SumBag, IEnumerable<int>>((name, value, bag) => Sum(bag, value),

x => x.IsOrImplOf<IEnumerable<int>>())

.Cache();

visitor.Run(model, sumBag);

sumBag.Sum.Should().Be(10);

}

private static void Sum(SumBag bag, IEnumerable<int> data)

{

bag.Sum += data.Sum();

}

public class SumBag

{

public int Sum { get; set; }

}

public class TestModel

{

public int[] List1 { get; set; } = null!;

public IEnumerable<int> List2 { get; set; } = null!;

public List<int> List3 { get; set; } = null!;

public HashSet<int> List4 { get; set; } = null!;

}

发布说明

Newbe.ObjectVisitor 0.2.10 发布，更花里胡哨
Newbe.ObjectVisitor 0.1.4 发布，初始版本

使用样例

Newbe.ObjectVisitor 样例 1

番外分享

寻找性能更优秀的动态 Getter 和 Setter 方案
寻找性能更优秀的不可变小字典

GitHub 项目地址：https://github.com/newbe36524/Newbe.ObjectVisitor

Gitee 项目地址：https://gitee.com/yks/Newbe.ObjectVisitor

本文作者： newbe36524
本文链接： https://www.newbe.pro/Newbe.ObjectVisitor/Example-1/
版权声明：本博客所有文章除特别声明外，均采用 BY-NC-SA 许可协议。转载请注明出处！

Newbe.ObjectVisitor 样例 1

将数据库链接字符串转型为数据模型，或者将数据模型格式化为链接字符串。

将对象中满足手机号码格式的字段替换为密文，避免敏感信息输出。

将实现了 IEnumerable<int> 的所有属性求和。

发布说明

使用样例

番外分享

将实现了 `IEnumerable<int>` 的所有属性求和。