(一)C#与SQL Server 2005（或以下版本）：
C# | C#取值 | SQL Server | SQL Server取值 |
System.DateTime | samlltime | ||
System.Object | variant |
(二)C#与SQL Server 2008（或以上版本）：
C# | C#取值 | SQL Server | SQL Server取值 |
System.Boolean | true/false | bit | 1/0 |
System.SByte | -128~127 | ||
System.Byte | 0~255 | tinyint | 0~255 |
System.Int16 | -32768~32767 | smallint | -32768~32767 |
System.UInt16 | 0~65535 | ||
System.Int32 | -2147483648~2147483647 | int | -2147483648~2147483647 |
System.UInt32 | 0~4294967295 | ||
System.Int64 | -9223372036854775808~ 9223372036854775807L | bigint | -9223372036854775808~9223372036854775807 |
System.UInt64 | 0~18446744073709551615UL | ||
System.Single | real | ||
System.Double | float | ||
System.Decimal | smallmoney | -214748.3648~214748.3647 | |
money | -922337203685477.5808~922337203685477.5807 | ||
decimal | -999999999999999999.49~999999999999999999.49 | ||
numeric | 1~38位 | ||
System.Char | |||
System.String | char | 1~8000 | |
varchar | 1~8000 | ||
nchar | 1~4000 | ||
nvarchar | 1~4000 | ||
text | |||
ntext | |||
time | 00:00:00.0000000~23:59:59.9999999 | ||
System.DateTime | date | 0001-01-01~9999-12-31 | |
smalldatetime | |||
datetime | 1753-01-01 00:00:00:000~9999-12-31 23:59:59.997 | ||
datetime2 | |||
datetimeoffset | |||
System.Byte[] | timestamp | ||
image | |||
binary | |||
varbinary | |||
System.Guid | uniqueidentifier | ||
System.Object | sql_variant |
(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 }