C# 与 SQL Server 的数据类型对应关系

(一)C#与SQL Server 2005（或以下版本）：

(二)C#与SQL Server 2008（或以上版本）：

(三)根据数据库数据类型字符，获取C#中对应的数据类型字符

1 /// <summary>
2 /// 将数据库数据类型字符串，转为C#数据类型字符串。
3 /// </summary>
4 /// <param name="dbType">数据库数据类型字符串。</param>
5 /// <returns>C#数据类型字符串。</returns>
6 private static string DBTypeToCSharpType(string dbType)
7 {
8     string cSharpType = string.Empty;
9     switch (dbType.ToLower())
10     {
11         case "bit":
12             cSharpType = "bool";
13             break;
14         case "tinyint":
15             cSharpType = "byte";
16             break;
17         case "smallint":
18             cSharpType = "short";
19             break;
20         case "int":
21             cSharpType = "int";
22             break;
23         case "bigint":
24             cSharpType = "long";
25             break;
26         case "real":
27             cSharpType = "float";
28             break;
29         case "float":
30             cSharpType = "double";
31             break;
32         case "smallmoney":
33         case "money":
34         case "decimal":
35         case "numeric":
36             cSharpType = "decimal";
37             break;
38         case "char":
39         case "varchar":
40         case "nchar":
41         case "nvarchar":
42         case "text":
43         case "ntext":
44             cSharpType = "string";
45             break;
46         case "samlltime":
47         case "date":
48         case "smalldatetime":
49         case "datetime":
50         case "datetime2":
51         case "datetimeoffset":
52             cSharpType = "System.DateTime";
53             break;
54         case "timestamp":
55         case "image":
56         case "binary":
57         case "varbinary":
58             cSharpType = "byte[]";
59             break;
60         case "uniqueidentifier":
61             cSharpType = "System.Guid";
62             break;
63         case "variant":
64         case "sql_variant":
65             cSharpType = "object";
66             break;
67         default:
68             cSharpType = "string";
69             break;
70     }
71     return cSharpType;
72 }