C#相当于SQL Server数据类型

对于以下SQL Server数据类型，C#中对应的数据类型是什么

精确数字

bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money

float
real

char
varchar
text

nchar
nvarchar
ntext

binary
varbinary
image

cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table

---

近似数字

bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money

float
real

char
varchar
text

nchar
nvarchar
ntext

binary
varbinary
image

cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table

---

日期和时间

date
datetimeoffset
datetime2
smalldatetime
datetime
time

---

字符串

bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money

float
real

char
varchar
text

nchar
nvarchar
ntext

binary
varbinary
image

cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table

---

Unicode字符串

bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money

float
real

char
varchar
text

nchar
nvarchar
ntext

binary
varbinary
image

cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table

---

二进制字符串

bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money

float
real

char
varchar
text

nchar
nvarchar
ntext

binary
varbinary
image

cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table

---

其他数据类型

bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money

float
real

char
varchar
text

nchar
nvarchar
ntext

binary
varbinary
image

cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table

（来源：）

这是给你的。和的表有更新版本

SQL Server数据类型及其.NET Framework等效项 下表列出了Microsoft SQL Server数据类型、它们在System.data.SqlTypes命名空间中的SQL Server公共语言运行库（CLR）中的等价物，以及它们在Microsoft.NET Framework中的本机CLR等价物

SQL Server data type          CLR data type (SQL Server)    CLR data type (.NET Framework)  
varbinary                     SqlBytes, SqlBinary           Byte[]  
binary                        SqlBytes, SqlBinary           Byte[]  
varbinary(1), binary(1)       SqlBytes, SqlBinary           byte, Byte[] 
image                         None                          None

varchar                       None                          None
char                          None                          None
nvarchar(1), nchar(1)         SqlChars, SqlString           Char, String, Char[]     
nvarchar                      SqlChars, SqlString           String, Char[] 
nchar                         SqlChars, SqlString           String, Char[] 
text                          None                          None
ntext                         None                          None

uniqueidentifier              SqlGuid                       Guid 
rowversion                    None                          Byte[]  
bit                           SqlBoolean                    Boolean 
tinyint                       SqlByte                       Byte 
smallint                      SqlInt16                      Int16  
int                           SqlInt32                      Int32  
bigint                        SqlInt64                      Int64 

smallmoney                    SqlMoney                      Decimal  
money                         SqlMoney                      Decimal  
numeric                       SqlDecimal                    Decimal  
decimal                       SqlDecimal                    Decimal  
real                          SqlSingle                     Single  
float                         SqlDouble                     Double  

smalldatetime                 SqlDateTime                   DateTime  
datetime                      SqlDateTime                   DateTime 

sql_variant                   None                          Object  
User-defined type(UDT)        None                          user-defined type     
table                         None                          None 
cursor                        None                          None
timestamp                     None                          None 
xml                           SqlXml                        None

---

SQL Server和.NET Framework基于不同类型的系统。例如，.NET Framework Decimal结构的最大刻度为28，而SQL Server Decimal和numeric数据类型的最大刻度为38。点击这里的！详情

---

SQL Server和.Net数据类型映射

---

如果有人正在寻找从C#和SQL Server格式转换为C#和SQL Server格式的方法，下面是一个简单的实现：

private readonly string[] SqlServerTypes = { "bigint", "binary", "bit",  "char", "date",     "datetime", "datetime2", "datetimeoffset", "decimal", "filestream", "float",  "geography",                              "geometry",                              "hierarchyid",                              "image",  "int", "money",   "nchar",  "ntext",  "numeric", "nvarchar", "real",   "rowversion", "smalldatetime", "smallint", "smallmoney", "sql_variant", "text",   "time",     "timestamp", "tinyint", "uniqueidentifier", "varbinary", "varchar", "xml" };
private readonly string[] CSharpTypes    = { "long",   "byte[]", "bool", "char", "DateTime", "DateTime", "DateTime",  "DateTimeOffset", "decimal", "byte[]",     "double", "Microsoft.SqlServer.Types.SqlGeography", "Microsoft.SqlServer.Types.SqlGeometry", "Microsoft.SqlServer.Types.SqlHierarchyId", "byte[]", "int", "decimal", "string", "string", "decimal", "string",   "Single", "byte[]",     "DateTime",      "short",    "decimal",    "object",      "string", "TimeSpan", "byte[]",    "byte",    "Guid",             "byte[]",    "string",  "string" };

public string ConvertSqlServerFormatToCSharp(string typeName)
{
    var index = Array.IndexOf(SqlServerTypes, typeName);

    return index > -1
        ? CSharpTypes[index]
        : "object";
}

public string ConvertCSharpFormatToSqlServer(string typeName)
{
    var index = Array.IndexOf(CSharpTypes, typeName);

    return index > -1
        ? SqlServerTypes[index]
        : null;
}

---

编辑：修正打字错误

我想这就是你可能想要的：你能解释一下为什么我的答案得到-1吗？不是我否决了答案，但理想情况下你应该回答这个问题，而不是提供一个链接。在.Net framework中，

short

应该使用哪种CLR数据类型（SQL Server）？@yogeshpatel，

short

（）等于此列表中的System.Int16。重要提示：SQL数据类型“float”默认为“float（54）”，它转换为C#“double”。但是，SQL数据类型“float（24）”仅转换为C#“float”。因此，如果您不需要很多精度数字，并且希望提高性能/内存，请在SQL中使用float（24），在C#中使用float类型。您的方法ConvertCSharpFormatToSqlServer将始终返回找到的第一个实例，因为CSharp类型不唯一，即“byte[]”将始终返回“binary”即使它被映射到其他5种Sql Server类型。@David虽然您所说的在技术上没有错，但当您使用

convertsqlserverformatocharp

方法时，它是有意义的。这只是一个例子，您可以根据自己的需要随时修改它。

public static string FromSqlType(string sqlTypeString)
{
    if (! Enum.TryParse(sqlTypeString, out Enums.SQLType typeCode))
    {
        throw new Exception("sql type not found");
    }
    switch (typeCode)
    {
        case Enums.SQLType.varbinary:
        case Enums.SQLType.binary:
        case Enums.SQLType.filestream:
        case Enums.SQLType.image:
        case Enums.SQLType.rowversion:
        case Enums.SQLType.timestamp://?
            return "byte[]";
        case Enums.SQLType.tinyint:
            return "byte";
        case Enums.SQLType.varchar:
        case Enums.SQLType.nvarchar:
        case Enums.SQLType.nchar:
        case Enums.SQLType.text:
        case Enums.SQLType.ntext:
        case Enums.SQLType.xml:
            return "string";
        case Enums.SQLType.@char:
            return "char";
        case Enums.SQLType.bigint:
            return "long";
        case Enums.SQLType.bit:
            return "bool";
        case Enums.SQLType.smalldatetime:
        case Enums.SQLType.datetime:
        case Enums.SQLType.date:
        case Enums.SQLType.datetime2:
            return "DateTime";
        case Enums.SQLType.datetimeoffset:
            return "DateTimeOffset";
        case Enums.SQLType.@decimal:
        case Enums.SQLType.money:
        case Enums.SQLType.numeric:
        case Enums.SQLType.smallmoney:
            return "decimal";
        case Enums.SQLType.@float:
            return "double";
        case Enums.SQLType.@int:
            return "int";
        case Enums.SQLType.real:
            return "Single";
        case Enums.SQLType.smallint:
            return "short";
        case Enums.SQLType.uniqueidentifier:
            return "Guid";
        case Enums.SQLType.sql_variant:
            return "object";
        case Enums.SQLType.time:
            return "TimeSpan";
        default:
            throw new Exception("none equal type");
    }
}

public enum SQLType
{
    varbinary,//(1)
    binary,//(1)
    image,
    varchar,
    @char,
    nvarchar,//(1)
    nchar,//(1)
    text,
    ntext,
    uniqueidentifier,
    rowversion,
    bit,
    tinyint,
    smallint,
    @int,
    bigint,
    smallmoney,
    money,
    numeric,
    @decimal,
    real,
    @float,
    smalldatetime,
    datetime,
    sql_variant,
    table,
    cursor,
    timestamp,
    xml,
    date,
    datetime2,
    datetimeoffset,
    filestream,
    time,
}