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authorchai <215380520@qq.com>2023-05-12 09:24:40 +0800
committerchai <215380520@qq.com>2023-05-12 09:24:40 +0800
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treea471fafed72e80b4ac3ac3002e06c34220dd6058 /ThirdParty/CsvHelper-master/src/CsvHelper.Website/input/examples/configuration/class-maps/constant-value/index.md
parentb8a694746562b37dc8dc5b8b5aec8612bb0964fc (diff)
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+# Constant Value
+
+You can set a constant value to a property instead of mapping it to a field.
+
+###### Data
+
+```
+Id,Name
+1,one
+```
+
+###### Example
+
+```cs
+void Main()
+{
+ using (var reader = new StreamReader("path\\to\\file.csv"))
+ using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
+ {
+ csv.Context.RegisterClassMap<FooMap>();
+ var records = csv.GetRecords<Foo>();
+ }
+}
+
+public class Foo
+{
+ public int Id { get; set; }
+ public string Name { get; set; }
+ public bool IsDirty { get; set; }
+}
+
+public sealed class FooMap : ClassMap<Foo>
+{
+ public FooMap()
+ {
+ Map(m => m.Id);
+ Map(m => m.Name);
+ Map(m => m.IsDirty).Constant(true);
+ }
+}
+```