我问的是一个很常见的功能,我找不到任何相关的信息。我想允许程序的用户使用程序中的变量创建自定义字符串。
示例:
我有一个清单:
ID Name Description Value Status
0 name 0 beschreibung 0 Wert 0 Status 0
1 name 1 beschreibung 1 Wert 1 Status 1
2 name 2 beschreibung 2 Wert 2 Status 2
3 name 3 beschreibung 3 Wert 3 Status 3
4 name 4 beschreibung 4 Wert 4 Status 4
5 name 5 beschreibung 5 Wert 5 Status 5
6 name 6 beschreibung 6 Wert 6 Status 6
7 name 7 beschreibung 7 Wert 7 Status 7
8 name 8 beschreibung 8 Wert 8 Status 8
9 name 9 beschreibung 9 Wert 9 Status 9
现在用户应该能够定义自定义字符串,如:
ID {ID}的项目名称为{名称}。它的描述是{Description}。它具有值{Value}和状态{Status}。
我可以为这些字符串编写自定义解析例程,但我希望找到该任务的标准解决方案。有什么建议吗?
答案 0 :(得分:3)
C#(以及一般的.NET)中字符串格式化的标准解决方案是使用the String.Format method。所以你可以这样做:
string reult = string.Format("The Name of the Item with the Id {0} is {1}. It's Description is {2}. It has the Value {3} and the Status {4}.",
id, name, description, value, status);
答案 1 :(得分:2)
我怀疑您想要使用对象列表中的值替换{ID}
和{Name}
等占位符。您可以使用带有
\{(?<key>[A-Za-z]+)\}
会找到{something}
的所有实例,并允许您提取something
以便从列表中获取值。
使用带有输入字符串和MatchEvaluator
委托的Regex.Match
重载,可以获得正确的值:
var myObject = new Dictionary<string,string>(){
{"ID","1"},
{"Name","Bob Jones"},
{"Description","A very nice man"},
{"Value","1000"},
{"Status","New"},
};
var regex = new Regex(@"\{(?<key>[A-Za-z]+)\}");
var input = "The Name of the Item with the Id {ID} is {Name}. It's Description is {Description}. It has the Value {Value} and the Status {Status}.";
string result = regex.Replace(input, m => myObject[m.Groups["key"].Value]);
Console.WriteLine(result);
实例:http://rextester.com/FLGTQW95860
该示例中的字典只是为了演示正则表达式的用法 - 没有理由不能成为DataRow
或自定义对象,或属性的任何其他容器。
当然这个解决方案不包含任何错误处理(例如属性不存在的占位符),如果你允许用户指定字符串,我怀疑你会想要包含它。 / p>
答案 2 :(得分:1)
你的意思是:
var x = String.Format("The Name of the Item with the Id {0} is {1}. It's Description is {2}. It has the Value {3} and the Status {4}.",object.Id, object.Name, object.Description, object.Value, object.Status);
还是我错过了这一点?
答案 3 :(得分:0)
您可以定义自己的类并覆盖ToString:
public class Program
{
static void Main(string[] args)
{
var aString = new MyString() {Description = "desc", Id = 1, Name = "Ja", Status = "st", Value = "Val"};
var myStrings = new List<MyString>() {aString};
foreach (MyString myString in myStrings)
{
//The Name of the Item with the Id 1 is Ja. It's Description is desc. It has the Value val and the Status st.
var outputStringVal = myString.ToString();
//
}
}
}
public class MyString
{
public int Id { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string Value { get; set; }
public string Status { get; set; }
public override string ToString()
{
return String.Format("The Name of the Item with the Id {0} is {1}. It's Description is {2}. It has the Value {3} and the Status {4}.", this.Id, Name, Description, Value, Status);
}
}
答案 4 :(得分:0)
您可以允许用户在字符串中使用指定的“变量”。例如:
var userstring = "The Name of the Item with the Id {ID} is {Name}. It's Description is {Description}. It has the Value {Value} and the Status {Status}.";
var result = userstring.Replace("{ID}", Id).Replace("{Name}", Name).Replace("{Description}", Description).Replace("{Value}", Value).Replace("{Status}", Status);