From c6f1314fa1316b797cdee509bf11fd7bda26f41d Mon Sep 17 00:00:00 2001 From: David Belmont Date: Thu, 6 Jul 2017 11:01:35 +1000 Subject: [PATCH] Fixing bug regarding the usage of Nullable properties. --- ExpressionBuilder.Test/BuilderTest.cs | 12 ++ ExpressionBuilder.Test/Models/Person.cs | 4 +- .../Controls/ucFilter.cs | 15 +- ExpressionBuilder.WinForms/MainForm.cs | 3 - ExpressionBuilder/Builders/FilterBuilder.cs | 12 +- ExpressionBuilder/Helpers/BuilderHelper.cs | 4 +- ExpressionBuilder/Interfaces/IFilter.cs | 26 ++- LICENSE | 201 ++++++++++++++++++ README.md | 94 +++++++- docs/BuildLinqExpressionsDynacallyFormUI.png | Bin 0 -> 8837 bytes 10 files changed, 342 insertions(+), 29 deletions(-) create mode 100644 LICENSE create mode 100644 docs/BuildLinqExpressionsDynacallyFormUI.png diff --git a/ExpressionBuilder.Test/BuilderTest.cs b/ExpressionBuilder.Test/BuilderTest.cs index 66e91c3..dd7b175 100644 --- a/ExpressionBuilder.Test/BuilderTest.cs +++ b/ExpressionBuilder.Test/BuilderTest.cs @@ -251,5 +251,17 @@ public void BuilderWithOperationNotSupportedBySpecificType() var ex = Assert.Throws(() => filter.By("Name", Operation.GreaterThan, "John")); Assert.That(ex.Message, Does.Match(@"The type '\w*' does not have support for the operation '\w*'.")); } + + [TestCase(TestName = "Builder working with nullable values")] + public void BuilderWithNullableValues() + { + var filter = new Filter(); + filter.By("Birth.Date", Operation.IsNotNull) + .Or.By("Birth.Date", Operation.GreaterThan, new DateTime(1980, 1, 1)); + var people = People.Where(filter); + var solution = People.Where(p => (p.Birth != null && p.Birth.Date != null) + || (p.Birth != null && p.Birth.Date.HasValue && p.Birth.Date > new DateTime(1980, 1, 1))); + Assert.That(people, Is.EquivalentTo(solution)); + } } } \ No newline at end of file diff --git a/ExpressionBuilder.Test/Models/Person.cs b/ExpressionBuilder.Test/Models/Person.cs index 7d3ca70..b21dd50 100644 --- a/ExpressionBuilder.Test/Models/Person.cs +++ b/ExpressionBuilder.Test/Models/Person.cs @@ -53,12 +53,12 @@ public override string ToString() public class BirthData { - public DateTime Date { get; set; } + public DateTime? Date { get; set; } public string Country { get; set; } public override string ToString() { - return string.Format("Born at {0} in {1}", Date.ToShortDateString(), Country); + return string.Format("Born at {0} in {1}", Date.Value.ToShortDateString(), Country); } } diff --git a/ExpressionBuilder.WinForms/Controls/ucFilter.cs b/ExpressionBuilder.WinForms/Controls/ucFilter.cs index d6e334a..55da216 100644 --- a/ExpressionBuilder.WinForms/Controls/ucFilter.cs +++ b/ExpressionBuilder.WinForms/Controls/ucFilter.cs @@ -60,11 +60,12 @@ private object GetValue(string ctrlName) if (ctrl != null) { var property = _properties[PropertyId]; - if (property.Info.PropertyType == typeof(string)) return ctrl.Text; - if (property.Info.PropertyType == typeof(DateTime)) return (ctrl as DateTimePicker).Value; - if (property.Info.PropertyType == typeof(int)) return Convert.ToInt32((ctrl as NumericUpDown).Value); - if (property.Info.PropertyType == typeof(bool)) return Boolean.Parse(ctrl.Text); - if (property.Info.PropertyType.IsEnum) return Enum.ToObject(property.Info.PropertyType, (ctrl as DomainUpDown).SelectedItem); + var type = Nullable.GetUnderlyingType(property.Info.PropertyType) ?? property.Info.PropertyType; + if (type == typeof(string)) return ctrl.Text; + if (type == typeof(DateTime)) return (ctrl as DateTimePicker).Value; + if (type == typeof(int)) return Convert.ToInt32((ctrl as NumericUpDown).Value); + if (type == typeof(bool)) return Boolean.Parse(ctrl.Text); + if (type.IsEnum) return Enum.ToObject(property.Info.PropertyType, (ctrl as DomainUpDown).SelectedItem); } return null; @@ -94,10 +95,6 @@ public UcFilter() // The InitializeComponent() call is required for Windows Forms designer support. // InitializeComponent(); - - // - // TODO: Add constructor code after the InitializeComponent() call. - // } public event EventHandler OnAdd; diff --git a/ExpressionBuilder.WinForms/MainForm.cs b/ExpressionBuilder.WinForms/MainForm.cs index 39977cf..8341657 100644 --- a/ExpressionBuilder.WinForms/MainForm.cs +++ b/ExpressionBuilder.WinForms/MainForm.cs @@ -49,9 +49,6 @@ public MainForm() // InitializeComponent(); - // - // TODO: Add constructor code after the InitializeComponent() call. - // AddFilter(); grid.DataSource = People; } diff --git a/ExpressionBuilder/Builders/FilterBuilder.cs b/ExpressionBuilder/Builders/FilterBuilder.cs index 317bdc6..7c3d7f2 100644 --- a/ExpressionBuilder/Builders/FilterBuilder.cs +++ b/ExpressionBuilder/Builders/FilterBuilder.cs @@ -95,12 +95,20 @@ private Expression ProcessListStatement(ParameterExpression param, IFilterStatem private Expression GetExpression(ParameterExpression param, IFilterStatement statement, string propertyName = null) { + Expression resultExpr = null; var memberName = propertyName ?? statement.PropertyId; Expression member = helper.GetMemberExpression(param, memberName); Expression constant = GetConstantExpression(member, statement.Value); Expression constant2 = GetConstantExpression(member, statement.Value2); - - Expression resultExpr = GetSafeStringExpression(member, statement.Operation, constant, constant2); + + if (Nullable.GetUnderlyingType(member.Type) != null && statement.Value != null) + { + resultExpr = Expression.Property(member, "HasValue"); + member = Expression.Property(member, "Value"); + } + + var safeStringExpression = GetSafeStringExpression(member, statement.Operation, constant, constant2); + resultExpr = resultExpr != null ? Expression.AndAlso(resultExpr, safeStringExpression) : safeStringExpression; resultExpr = GetSafePropertyMember(param, memberName, resultExpr); if ((statement.Operation == Operation.IsNull || statement.Operation == Operation.IsNullOrWhiteSpace) && memberName.Contains(".")) diff --git a/ExpressionBuilder/Helpers/BuilderHelper.cs b/ExpressionBuilder/Helpers/BuilderHelper.cs index 1f4454b..6a143ae 100644 --- a/ExpressionBuilder/Helpers/BuilderHelper.cs +++ b/ExpressionBuilder/Helpers/BuilderHelper.cs @@ -18,8 +18,8 @@ public Expression GetMemberExpression(Expression param, string propertyName) var subParam = Expression.Property(param, propertyName.Substring(0, index)); return GetMemberExpression(subParam, propertyName.Substring(index + 1)); } - - return Expression.Property(param, propertyName); + + return Expression.Property(param, propertyName); } } } \ No newline at end of file diff --git a/ExpressionBuilder/Interfaces/IFilter.cs b/ExpressionBuilder/Interfaces/IFilter.cs index 26aa0f9..3fb8080 100644 --- a/ExpressionBuilder/Interfaces/IFilter.cs +++ b/ExpressionBuilder/Interfaces/IFilter.cs @@ -12,16 +12,24 @@ public interface IFilter /// Group of statements that compose this filter. /// IEnumerable Statements { get; } - /// - /// Adds another statement to this filter. - /// - /// Name of the property that will be filtered. - /// Express the interaction between the property and the constant value. - /// Constant value that will interact with the property, required by operations that demands one value or more. + /// + /// Add a statement, that doesn't need value, to this filter. + /// + /// Property identifier conventionalized by for the Expression Builder. + /// Express the interaction between the property and the constant value. + /// Establishes how this filter statement will connect to the next one. + /// A FilterStatementConnection object that defines how this statement will be connected to the next one. + IFilterStatementConnection By(string propertyId, Operation operation, FilterStatementConnector connector = FilterStatementConnector.And); + /// + /// Adds another statement to this filter. + /// + /// Name of the property that will be filtered. + /// Express the interaction between the property and the constant value. + /// Constant value that will interact with the property, required by operations that demands one value or more. /// Constant value that will interact with the property, required by operations that demands two values. - /// Establishes how this filter statement will connect to the next one. - /// A FilterStatementConnection object that defines how this statement will be connected to the next one. - IFilterStatementConnection By(string propertyName, Operation operation, TPropertyType value, TPropertyType value2 = default(TPropertyType), FilterStatementConnector connector = FilterStatementConnector.And); + /// Establishes how this filter statement will connect to the next one. + /// A FilterStatementConnection object that defines how this statement will be connected to the next one. + IFilterStatementConnection By(string propertyId, Operation operation, TPropertyType value, TPropertyType value2 = default(TPropertyType), FilterStatementConnector connector = FilterStatementConnector.And); /// /// Removes all statements from this filter. /// diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..8dada3e --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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If you ever tried, maybe you found it a little complicated. If you never tried, believe me when I say it could be, at least, tedious to do. This project aims to give your application the ability to enable your users to create their own filters to query lists or even databases. If you would like more details on how it works, please, check out the article [Build Lambda Expression Dinamically](https://www.codeproject.com/Articles/1079028/Build-Lambda-Expressions-Dynamically) +# Expression Builder +Have you ever tried to provide your users a way to dynamically build their own query to filter a list? If you ever tried, maybe you found it a bit complicated. If you never tried, believe me when I say it could be, at least, tedious to do. This project aims to give your application the ability to enable your users to create their own filters to query lists or even databases. If you would like more details on how it works, please, check out the article [Build Lambda Expression Dinamically](https://www.codeproject.com/Articles/1079028/Build-Lambda-Expressions-Dynamically). + +# Motivation +Let us imagine we have classes like this... +``` +public enum PersonGender +{ + Male, + Female +} + +public class Person +{ + public int Id { get; set; } + public string Name { get; set; } + public PersonGender Gender { get; set; } + public BirthData Birth { get; set; } + public List Contacts { get; private set; } + public Company Employer { get; set; } + + public class BirthData + { + public DateTime Date { get; set; } + public string Country { get; set; } + } + + public class Company { + public string Name { get; set; } + public string Industry { get; set; } + } +} + +public enum ContactType +{ + Telephone, + Email +} + +public class Contact +{ + public ContactType Type { get; set; } + public string Value { get; set; } + public string Comments { get; set; } +} +``` +...and we have to build the code behind a form like this one to filter a list of Person objects: + +![FormUI](docs\BuildLinqExpressionsDynacallyFormUI.png) + +Now, what about being able to do it in a way like this: +``` +var filter = new Filter(); +filter.By("Id", Operation.Between, 2, 4, FilterStatementConnector.And); +filter.By("Contacts[Value]", Operation.EndsWith, "@email.com", default(string), FilterStatementConnector.And); +filter.By("Birth.Country", Operation.IsNotNull, default(string), default(string), FilterStatementConnector.Or); +filter.By("Name", Operation.Contains, " John"); +var people = People.Where(filter); + +//or like this... + +var filter = new Filter(); +filter.By("Id", Operation.Between, 2, 4) + .And.By("Birth.Country", Operation.IsNotNull) + .And.By("Contacts[Value]", Operation.EndsWith, "@email.com") + .Or.By("Name", Operation.Contains, " John "); +var people = People.Where(filter); +``` +So that would generate an expression like this: +``` +People.Where(p => (p.Id >= 2 && p.Id <= 4) + && (p.Birth != null && p.Birth.Country != null) + && (p.Contacts != null && p.Contacts.Any(c => c.Value.Trim().ToLower().EndsWith("@email.com"))) + || (p.Name != null && p.Name.Trim().ToLower().Contains("john"))); +``` + +Would this help you anyway? Well, if your answer was 'yes', then you just found the right project. + +# License +Copyright 2017 David Belmont + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at [LICENSE](LICENSE) + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. + +Icon by [Alina Oleynik](https://thenounproject.com/dorxela), Ukraine diff --git a/docs/BuildLinqExpressionsDynacallyFormUI.png b/docs/BuildLinqExpressionsDynacallyFormUI.png new file mode 100644 index 0000000000000000000000000000000000000000..1ca616b67b1c76c892903737639da4155cdb561d GIT binary patch literal 8837 zcmeHsdsLF^)~}Um7GBC)vNSbUnc7XtG)0k&c6rH5mfbYetSl`x(NGaFE$oh&rJ2{# zyydM@Qv@$m)KanK4KJXX1t|)W0tzDEi>~%wd+fE&clH_kjPac@&L8;rGG4}<&wS=H zf4}*gH{4wIt1j1GuArcx>R`XuT|q$+5B#6LObPhAd_0>AEQ?U?`}Zi6($>@r|T;R3;D8L;>~RYb@ibqv9afu+Z|Q3F^S_MM5(Df6yhjLzj{Z{=Q- zi3BqI-bK8sTHim~UemD`^UfD)qZXuefTStB8P9xFbfbt2T|RARf2}+*~ek z1}DzVu(NJ0!za5t0Zuaf)K_%xOv$A`Lg{+e-8Fn}UtUdvHb+7&bAebwGVEXPBPqx7cpRW|H9Mt#H1W9LSeMM74lo)kQkV)RV z!i8OLeC)LGy@vc;&Xz{#Ivqmm^LzgGWB?$W}HD@=W5_MA?u`UxUA-V zUZY!2b&)I7V$nSxdlU0LK(grpN&MJJ+qWtr^5^qHEs*mjtm&yZgV(=R2M@leR<4ma zssc8GAYqXo*Mm<5R15cR2SaB)cGLi#-JZ{Z7@1Ub%WE~rL()A|_GYg09LfDx5(+@?y;_gU>1b@m}XwDcsUq+RsOWh~@y#%f9b zrZyt|Xro5|=Mq!RSe-sI>JhE~uD(KYIu>J;rAbaaN#w~y#?=hp+Nt~loN5z3U1 zgjH7;uXYc-zl{_#%#gO4-VtLuMLf|h(e%vo4`A3mb$krh7T1#ncL#!EKOdBnPkW0$ zlZr3(QAV+xY2Fi+-+d32bZE39*YHkOFuYbBM!hl6ye=bJe5#eb1Nq+Ow6s?UR)Tb2 z#ph7gMaq7aqf~Q9qI6(szpqG0`90_jszmnLA@>31dyA zlj-^qxG8B7JxF&+AS%%HOI*%qSt542PXA@Hdq6r6(I6k~CkuWtC}dm!&r^Pi*8zta zb36CGJo*-Mbjz-kopb>ep6%j)bAU4!7W8@>;o}ipzZ|Ipk`k|*h zA|6`3eQ6%PMQ~F4yP}7w1?eH@ZNPnJi!a8n&s%&w>$hU?sf+OO+#L%kna-2WeK1XI zKvt+!PwmwPdE~gw*1J4g$j-DyBdf3okCzEun4?!*;hXY;o-gEnD9QoL)c2-T&-=2{ z?5by}*-PpXx7JfNuxMU;qA`+c7zjQjM!qRsfe(f6rs(O=FSxNSo@I9?){vW*A_UL0 zm3J}kY&vK06-cuP=4e&<6*^W&4;|GSv4lq!@&%asdY^O6rQ=~A_bGETK0ptQe8of z*PEV&1^F$X&u-sFH}Q>(Dlf=kxakz9pPLsc{Ya5eGxj`XUGhiPizF-XRot{pOEr%! zjc~DH#Hn(i{vhX_fXil4f2^8z=xr*v_3Je4U!A=&V!OTbH4AFC3#GcEXAZ!>2^?R_65NL-IJ z&Vc5Cd186kWFZxR3oR85?q{wO7lz|P!Xdf;xO5pcxe-#NH-}!cdoWyP^Yfmlj7N`a z@EY?OOBz=HK0$d-wivU^l9!}yl6$Rt-gm@!b>6yEwhzXryKJO5I(4aylSQiMX(`Gp z`{Y7tqI=^i-_*CYOBVkDBkZ6lVJ~9sVTY~;N*2+jW~Y~pgr5y!rR|xo{^pk8#qSRO zE7D})=6YA+A2PA(lK+c>0 z6y5h51MiI9bAs$FnMau-FldqJ={zwB$yq$H>@%rZPst{Yq4(35(k{JT_q!Jz0`1Sl z8_0Q0w<|;uSjrE^$sc3ytO6|p)(Zd`0G7WZKPqz4reNXtr$0Sx0Tzn|n?v@C)%rqV zixe8BLg@j7E$G{?*2L#{*T*bEyY;0{>3V+EvQTIUeSUtM!@shgaBj+K1%-|ie-WMx ziQ!U(hF5<@D%dd&ixeOw=Bu_w55KsX9e^Tlxai%-l84 zryebwZLK93dToPpp#J9pZ*&{%%0~$YC4r69nT9u@W-x}}696+|iG#-NZungP#4t5c zP?-5hus(NdKP*CHqqk1W$AgdBO)#Rguo@~Xl^yMGZ*QVb`8r) zRa4<=sPB9-y*Vytd#RZdwcDu0Bra!>j7GbZdLW_BWkM5XqzQU!XhR48rKaTfm=&q)m#Q&P;ayaQD>LYpBe|G zmc?~Oq}c_;s1;f%UBaB)ZXV+*!nx|b1^+M#J4&5I>_Cf7O4zLLV+Y!K4>>Jk6>Cnz z6+%PK+pjJgPBOo30&vA)smF@}JJhVfi&v$V1s|?i>?Z}<+OTf=6xi}z%kJw;bcCY` zWiptrRhsH3W1b>a+a=Rxq7YE6ZehCh5}I@_@$76SSC(m$8P1LOyY=ePV3#Cy)jrl)GIY?UDHD7W$x-n%!1*1{&!DhAB;^#G=tU2d|lQzQf3 zRpYiip|mIU{^W~lHt%DHbnyOul#{E10))i%a!)0CW-T7A5$f|b5qAPh%}{1^4PTc> zo59*n0BKQDMmT@Gr*_f9*qwPKYfFZK>GA`8h`}L#irT#rg=ZmgTo1xUQjCi%t=Qaa zB}mmu7{+7{b8xN^HuJ1YQs?l+g8r0@^7pCFgo#X5W7;!$dV{^gXDVsZq{Rw8Cjh{< zjPIV@t(yvZ48J?%c;EE2H`-<%NVR{F=h{T5IaAPq3k(d2U)V`OGSR zeJ`qh#}~$kmB^ay7v}x7omWv$>Y9u*2>88fg>AD!-$AxD4TIci@l0dB z!kz?!V2Ps}tVO})4K|LdH8;ueo74ZSQdjo*7)y9_4U3btLshZLbW4%ba)sFQCG$|g zhE^@KN-m$;DPEqMjnIzt{40-A@kot+g_h<9C}%U?uhldTbQBh!I&ix%lHFJ z%YUi~tla<5dSBno#*ctB5o>LH(M5c>#1Zog$kWlJatc89z{+Pe8%Q*eciS0&0sK8K z9t$1edccii#eadC{{!C%RKb&RQGGD1IA$8yVAVf1n9k|>9KOX@weZeT1dm8(=QAfc z7#3NA!St%DmQ>+@|4 z28Rt2d49$F_$T=ka9>WcYkjWYe`Vy@__3``zew-f*{#mUrq1v32CWCX2Lu8VQ}^f- zn@=N=B5@{eY!#rGuGNUt7y2`(!~JFA ze64p!OCJ{ zmRGu7GkG7IH{xX~_#9g~nfUJ84Hw92Wm~>cLQKp6wkOM4KTR=LQ1}F4zv|jnkL)ne z-88qn$XS!qR$mWD$_RuqZ&O;3I4*m#(G86q;tNt{B(;IMwZMj90F8d$^)_<1x$;i> z_n``jEGCeZ$S>tnU(;Gzy%5XraRIN#BvEOp|@6jGIQ?iSQu?B z?cOQZJhq!=(^^`E6HPW%Awdad4BuxBvfHHD!Q(bBJTbqh;)`~(6C> z^T;_UE_|esy|cQ@*D;yY>FX%LORf5@nlb~FotbPj(zJ9;toA@k=0^p46WvFJ@>}_! zZAnsZB?^Z+nbop(z5G;x-go8MH2_yx^kPlGPMWgO2&$IicXadGk>f{YoGy;e+>%nl z(Dd}!_N-hx7Yq!>+b`^Cio(RGwfr)WO}lu&uFwFb^JWGzaT8S#PD6&yRkumYOT`_w zt$~&FBq6d|3)4-b5c7=MeZH+$%FF7z5ub^0>tIAq?>wmeTp#2<6w#!ujFtWhqD#&4mUYtysR4HQk7~s`N%864oNX~k*}7EKP&Ff8j`DAyUt#g5 zagf!WfzQ2(@UR=of(dbn=4ZwUbwd3Xup^T5Dbx9#;14{9u^RMM{1nwcFLJ7dcFZ^h+oeO+Y)=)%+WgrWUnm2_0r`@+$tkgpoc-=ZaN65ac^ zHENU}(PA$u;Y=^;ZCqALn$MQ7v$7R$Ij_T1&+iT&$2=x$RW#4>M^FY%mkWr1LU(mN zA9W%=G#nS1I(`yWbi&ouGHf<;sOJe)SQ1`F$~0(nYddi){Rc?`#K~tq#%Q%OlAUB; zi`7vQGJ-qD2<~2;`4XP*nsZRv^GZ}pG6whE42%MD<+JNz4;gkk4;)mq_}(|pp>SD7 z=4GZfsH;t152V|TijH2${RFy;H)q-l=vtisJ-z%$3Tsgpmip*Snvbzu7@5EF>3<+v z6ZbMf`B%zq7eOhX_=-P+L2nTuMi;E2317@Rc)d2{$tbMSwe12?bc~CVaG+AJ`#u>? 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