Question

我在这里有个问题。

我正在获取看起来像这样的字符串：“简单文本：{1}，日期：{3}”->从数据库中获取我想用employee.Name替换“ {1}”，用Date.Now替换“ {3}”。用我从数据库中知道的替换哪个数字，有很多不同的类型，因此我需要动态地执行此操作，因此字符串替换应如下所示：

String.Replace("{someNumber}", extract from the database but it is a string but should be property like emplayee.Name).

我不知道该怎么做，因为函数将“ emplayee.Name”而不是“ John”（即employeeName）放入

这里是一个示例： content = content.Replace(match.ToString(), emailVariableDictionary[ExtractIdFromMatch(match.ToString())].Variable);

emailVariableDictionary是一个列表，其中包含诸如“ employee.Name，Date.Now”之类的字符串，并且像String.Format之前的“ emplyee.Name”而不是“ John”之前所说的那样

Answer 1

var template = "simple text : {0}, and date : {1}";
var replacedString = string.Format(template, "John",DateTime.Now);

如果我使用您的“简单文本：{1}和日期：{3}”，则字符串格式基于索引，您可以使用以下格式

var template = "simple text : {1}, and date : {3}";
var replacedString = string.Format(template,"index 0", "John","index 2",DateTime.Now);

Answer 2

请使用字符串插值概念。它在下面的链接中可用

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated

示例：

string name = "Mark";
var date = DateTime.Now;

// Composite formatting:
Console.WriteLine("Hello, {0}! Today is {1}, it's {2:HH:mm} now.", name, date.DayOfWeek, date);
// String interpolation:
Console.WriteLine($"Hello, {name}! Today is {date.DayOfWeek}, it's {date:HH:mm} now.");
// Both calls produce the same output that is similar to:
// Hello, Mark! Today is Wednesday, it's 19:40 now.

将字符串替换为从列表中提取的属性

2 个答案: