我将我的答案分为两个部分：
第一个是如何将一些通用项目列表导出到 csv 中，带有编码、标题 - （它只会为指定的标题构建 csv 数据，并且会忽略不需要的属性）。
public string ExportCsv<T>(IEnumerable<T> items, Dictionary<string, string> headers)
{
string result;
using (TextWriter textWriter = new StreamWriter(myStream, myEncoding))
{
result = this.WriteDataAsCsvWriter<T>(items, textWriter, headers);
}
return result;
}
private string WriteDataAsCsvWriter<T>(IEnumerable<T> items, TextWriter textWriter, Dictionary<string, string> headers)
{
//Add null validation
////print the columns headers
StringBuilder sb = new StringBuilder();
//Headers
foreach (KeyValuePair<string, string> kvp in headers)
{
sb.Append(ToCsv(kvp.Value));
sb.Append(",");
}
sb.Remove(sb.Length - 1, 1);//the last ','
sb.Append(Environment.NewLine);
//the values
foreach (var item in items)
{
try
{
Dictionary<string, string> values = GetPropertiesValues(item, headers);
foreach (var value in values)
{
sb.Append(ToCsv(value.Value));
sb.Append(",");
}
sb.Remove(sb.Length - 1, 1);//the last ','
sb.Append(Environment.NewLine);
}
catch (Exception e1)
{
//do something
}
}
textWriter.Write(sb.ToString());
return sb.ToString();
}
//Help function that encode text to csv:
public static string ToCsv(string input)
{
if (input != null)
{
input = input.Replace("\r\n", string.Empty)
.Replace("\r", string.Empty)
.Replace("\n", string.Empty);
if (input.Contains("\""))
{
input = input.Replace("\"", "\"\"");
}
input = "\"" + input + "\"";
}
return input;
}
这是最重要的功能，它从（几乎）任何通用类中提取属性值。
private Dictionary<string, string> GetPropertiesValues(object item, Dictionary<string, string> headers)
{
Dictionary<string, string> values = new Dictionary<string, string>();
if (item == null)
{
return values;
}
//We need to make sure each value is coordinated with the headers, empty string
foreach (var key in headers.Keys)
{
values[key] = String.Empty;
}
Type t = item.GetType();
PropertyInfo[] propertiesInfo = t.GetProperties();
foreach (PropertyInfo propertiyInfo in propertiesInfo)
{
//it not complex: string, int, bool, Enum
if ((propertiyInfo.PropertyType.Module.ScopeName == "CommonLanguageRuntimeLibrary") || propertiyInfo.PropertyType.IsEnum)
{
if (headers.ContainsKey(propertiyInfo.Name))
{
var value = propertiyInfo.GetValue(item, null);
if (value != null)
{
values[propertiyInfo.Name] = value.ToString();
}
}
}
else//It's complex property
{
if (propertiyInfo.GetIndexParameters().Length == 0)
{
Dictionary<string, string> lst = GetPropertiesValues(propertiyInfo.GetValue(item, null), headers);
foreach (var value in lst)
{
if (!string.IsNullOrEmpty(value.Value))
{
values[value.Key] = value.Value;
}
}
}
}
}
return values;
}
GetPropertiesValues 的示例：
public MyClass
{
public string Name {get; set;}
public MyEnum Type {get; set;}
public MyClass2 Child {get; set;}
}
public MyClass2
{
public int Age {get; set;}
public DateTime MyDate {get; set;}
}
MyClass myClass = new MyClass()
{
Name = "Bruce",
Type = MyEnum.Sometype,
Child = new MyClass2()
{
Age = 18,
MyDate = DateTime.Now()
}
};
Dictionary<string, string> headers = new Dictionary<string, string>();
headers.Add("Name", "CustomCaption_Name");
headers.Add("Type", "CustomCaption_Type");
headers.Add("Age", "CustomCaption_Age");
GetPropertiesValues(myClass, headers)); // OUTPUT: {{"Name","Bruce"},{"Type","Sometype"},{"Age","18"}}