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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

使用样例

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

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

Newbe.ObjectVisitor

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