如何解决是否可以在不使用串联器的情况下在字符串变量中包含C＃变量？
| .NET 3.5 C＃是否允许我们在字符串变量中包含一个变量，而不必使用+连接符（或string.Format（））。 例如（在伪代码中，我使用$符号指定变量）：DateTime d = DateTime.Now;
string s = \"The date is $d\";
Console.WriteLine(s);
string GetPageData()
{
string title = \"Hello\";
DateTime date = DateTime.Now;
string html = @\"
<!DOCTYPE html PUBLIC ...>
<html>
<head>
<title>$title</title>
</head>
<body>
<div>Hello StackO</div>
<div>The date is $date</div>
</body>
</html>
\";
}
解决方法
几乎是一种小的扩展方法。
static class StringExtensions
{
public static string PHPIt<T>(this string s,T values,string prefix = \"$\")
{
var sb = new StringBuilder(s);
foreach(var p in typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
sb = sb.Replace(prefix + p.Name,p.GetValue(values,null).ToString());
}
return sb.ToString();
}
}
string foo = \"Bar\";
int cool = 2;
var result = \"This is a string $foo with $cool variables\"
.PHPIt(new {
foo,cool
});
//result == \"This is a string Bar with 2 variables\"
Console.WriteLine(\"The date is {0}\",DateTime.Now);
string output = \"the date is $d and time is $t\";
output = output.Replace(\"$t\",t).Replace(\"$d\",d); //and so on
string.Format
public static class StringExtensions
{
public static string Replace<T>(this string text,T values)
{
var sb = new StringBuilder(text);
var properties = typeof(T)
.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.ToArray();
var args = properties
.Select(p => p.GetValue(values,null))
.ToArray();
for (var i = 0; i < properties.Length; i++)
{
var oldValue = string.Format(\"{{{0}\",properties[i].Name);
var newValue = string.Format(\"{{{0}\",i);
sb.Replace(oldValue,newValue);
}
var format = sb.ToString();
return string.Format(format,args);
}
}
var hello = \"Good morning\";
var world = \"Mr. Doe\";
var s = \"{hello} {world}! It is {Now:HH:mm}.\"
.Replace(new { hello,world,DateTime.Now });
Console.WriteLine(s); // -> Good morning Mr. Doe! It is 13:54.
string.Format(\"The date is {0}\",DateTime.Now.ToString())
string s = \"The date is {0}\".Format(d);
string s = string.Format(\"The date is {0}\",d);
ToString
string parameterName = \"Example\";
int parameterValue = 1;
Stringbuilder builder = new StringBuilder();
builder.Append(\"The output parameter \");
builder.Append(parameterName);
builder.Append(\"\'s value is \");
builder.Append(parameterValue.ToString());
string totalExample = builder.ToString();
\"The title is \\{title}\"Console.WriteLine(\"The date is {0}\",DateTime.Now);
string value = null;
Console.WriteLine(\"The value is \'{0}\'\",value); // OK
Console.WriteLine(\"The value is \'{0}\'\",value.ToString()); // FAILURE
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