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C# 从模板文件加载文本_C#_Arrays_File_Text - Fatal编程技术网

C# 从模板文件加载文本

C# 从模板文件加载文本,c#,arrays,file,text,C#,Arrays,File,Text,目前我在数组中有很多字符串,可以填充各种数据。例如: var obj = new Example(); var test = new Test(); // This must be stored in a text file var text = new[] { $"{obj} contains {obj.attribute}", $"This is a {test.title}" } foreach (var line in text) Console.Wr

目前我在
数组中有很多
字符串
,可以填充各种数据。例如:

var obj = new Example();    
var test = new Test();

// This must be stored in a text file
var text = new[] {
    $"{obj} contains {obj.attribute}",
    $"This is a {test.title}"
}

foreach (var line in text)
    Console.WriteLine(line);
如您所见,这个
文本
数组填充了不同的字符串,其中包含外部数据(例如,来自
obj
测试
对象的数据)


我的问题: 目标是从
.txt文件
中读取
文本
行,并将它们加载到
文本
变量中,因此结果与上面相同


唯一的条件是此文本文件必须包含所有“变量”,如
obj
test.title
,以便打印这些对象中包含的正确数据。如何将这些行存储在
.txt文件中并加载到应用程序中?

您将需要创建占位符

在文件中,将有以下行:

${obj} contains ${obj.attribute}
This is a ${test.title}"
占位符是${…}

然后需要逐行解析文件

您可以解析占位符

在占位符中,字符串的第一部分是对象的名称

因此,您需要将程序中现有对象的映射器映射到文件中的对象

然后,使用该映射器创建容器

然后将对象从文件映射到容器中的对象,并使用反射获得占位符中定义的值

另一种方式:

您只有占位符和映射器

存档:

${obj} contains ${obj.attribute}
    This is a ${test.title}"
映射器(例如字典)

var fileMapper=新字典
{
[“obj”]=“SFS”,
[“对象属性”]=“SFS”
};
现在您需要获取占位符并替换为对象形式字典

反省不是必要的

完整的工作示例(编译和测试)

类示例
{
public void GetFile()
{
var fileMapper=新字典
{
[“obj”]=“SFS”,
[“对象属性”]=“SFS”
};
var fileLines=新列表();
使用(var sr=newstreamreader(“文件名”))
{
var line=string.Empty;
而((line=sr.ReadLine())!=null)
{
ListListofPlaceholders=this.GetPlaceHolders(第行);
对于(变量i=0;i
您需要创建占位符

在文件中,将有以下行:

${obj} contains ${obj.attribute}
This is a ${test.title}"
占位符是${…}

然后需要逐行解析文件

您可以解析占位符

在占位符中,字符串的第一部分是对象的名称

因此,您需要将程序中现有对象的映射器映射到文件中的对象

然后,使用该映射器创建容器

然后将对象从文件映射到容器中的对象,并使用反射获得占位符中定义的值

另一种方式:

您只有占位符和映射器

存档:

${obj} contains ${obj.attribute}
    This is a ${test.title}"
映射器(例如字典)

var fileMapper=新字典
{
[“obj”]=“SFS”,
[“对象属性”]=“SFS”
};
现在您需要获取占位符并替换为对象形式字典

反省不是必要的

完整的工作示例(编译和测试)

类示例
{
public void GetFile()
{
var fileMapper=新字典
{
[“obj”]=“SFS”,
[“对象属性”]=“SFS”
};
var fileLines=新列表();
使用(var sr=newstreamreader(“文件名”))
{
var line=string.Empty;
而((line=sr.ReadLine())!=null)
{
ListListofPlaceholders=this.GetPlaceHolders(第行);
对于(变量i=0;iusing System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;


namespace ConsoleApplication1 {
    public class TemplateParser {

        private string content;

        public TemplateParser(string fileName) {
            Tags = new Dictionary<string, object>();
            //TODO: Add exception control. Perhaps move the reading operation outside the constructor
            content = File.ReadAllText(fileName);
        }

        public Dictionary<string, object> Tags { get; private set; }

        public void Parse() {
            foreach (string key in Tags.Keys) {
                if (Tags[key] != null) {
                object propertyValue;
                int position = key.IndexOf('.');
                if (position >= 0) {
                    string propertyName = key.Substring(position + 1);
                    propertyValue = GetPropertyValue(Tags[key], propertyName);
                } else {
                    propertyValue = Tags[key];
                }
                content = content.Replace(string.Concat("{", key, "}"), propertyValue.ToString());
                } else {
                    //TODO: what to do without not specified replacement?
                }
            }
        }

        public string[] ToArray() {
            return content.Split(new string[] {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries);
        }


        private object GetPropertyValue(object obj, string propertyName) {
            PropertyInfo pi = obj.GetType().GetProperties().FirstOrDefault(x => x.Name == propertyName);
            if (pi != null) {
                return pi.GetValue(obj, null);
            }
            return null;
        }

    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1 {
    class Program {
        static void Main(string[] args) {
            TemplateParser parser = new TemplateParser("C:\\myTextFile.txt");
            parser.Tags.Add("obj", 1);
            parser.Tags.Add("Test", new Test { Id = 1, Title = "This is a text" });

            parser.Parse();
            foreach (string line in parser.ToArray()) {
                Console.WriteLine(line);
            }
        }
    }

    class Test {
        public int Id { get; set; }
        public string Title { get; set; }
    }
}
public class TemplateParser
{
    private string _content;
    public Dictionary<string, object> Variables { get; } = new Dictionary<string, object>();

    public TemplateParser(string filepath)
    {
        try
        {
            _content = File.ReadAllText(filepath);
        }
        catch (IOException)
        {
            Console.WriteLine("File could not be found on the following location:\n" + filepath);
        }
    }

    public void Parse()
    {
        var placeholder = "";
        var beginIndex = 0;
        var busy = false;

        for (var i = 0; i < _content.Length; i++)
            switch (_content[i])
            {
                case '{':
                    placeholder = "";
                    busy = true;
                    beginIndex = i;

                    break;
                case '}':
                    if (placeholder != "")
                    {
                        var position = placeholder.IndexOf('.');
                        var success = false;

                        try
                        {
                            object pValue;
                            if (position >= 0)
                            {
                                var pName = placeholder.Substring(position + 1);
                                pValue = GetPropertyValue(Variables[placeholder.Substring(0, position)], pName);
                            }
                            else pValue = Variables[placeholder];

                            if (pValue == null)
                            {
                                Console.WriteLine("Property not found");
                                throw new KeyNotFoundException("Property not found");
                            }

                            _content = _content.Replace("{" + placeholder + "}", pValue.ToString());
                            success = true;
                        }
                        catch (KeyNotFoundException)
                        {
                            Console.WriteLine("WARNING: Placeholder {" + placeholder + "} is unknown");
                            _content = _content.Replace("{" + placeholder + "}", "x");
                        }

                        busy = false;
                        if (success) i = beginIndex;
                    }

                    break;
                default:
                    if (busy) placeholder += _content[i];
                    break;
            }
    }

    private static object GetPropertyValue(object obj, string propertyName)
    {
        var pi = obj.GetType().GetProperties().FirstOrDefault(x => x.Name == propertyName);

        FieldInfo fi = null;
        if (pi == null)
            foreach (var x in obj.GetType().GetFields().Where(x => x.Name == propertyName))
            {
                fi = x;
                break;
            }

        return pi != null ? pi.GetValue(obj) : fi?.GetValue(obj);
    }

    public string[] ToArray() => _content.Split(new[] {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries);
}